Find the LCM of the three bells that is 20,40,30.The answer you get is 120 minutes which is equal to 2 hours. Then add the LCM(2 hours) to 10.00am which gives the answer as 12.00 at noon.
Take the answer (12.00) and add 4 hours which will give the answer of the third time they will ring together. You get 16.00 which is equal to 4.00pm
Elcis answered the question on November 14, 2017 at 10:47
-
What is the error in the sum of 5.5 cm and 7.1 cm, if each represents a measurement?
(Solved)
What is the error in the sum of 5.5 cm and 7.1 cm, if each represents a measurement?
Date posted:
November 11, 2017
.
Answers (1)
-
For each of the following functions, find the inverse of the function (a)f(x)=x³+6 (b)f(x)=4v(5x+8)
(Solved)
For each of the following functions, find the inverse of the function (a)f(x)=x³+6 (b)f(x)=4v(5x+8)
Date posted:
November 10, 2017
.
Answers (1)
-
If A={2,5,8} and B={0,2,6,9}, then AUB will be?
(Solved)
If A={2,5,8} and B={0,2,6,9}, then AUB will be?
Date posted:
November 10, 2017
.
Answers (1)
-
A vehicle travelled for 4(1/2)hours and covered a distance of 844 km. estimate the speed of the vehicle.
(Solved)
A vehicle travelled for 4(1/2)hours and covered a distance of 844 km. estimate the speed of the vehicle.
Date posted:
November 10, 2017
.
Answers (1)
-
Truncate 661.7 to
a. 3 significant figures
b. 2 significant figures
(Solved)
Truncate 661.7 to
a. 3 significant figures
b. 2 significant figures
Date posted:
November 10, 2017
.
Answers (1)
-
What is truncation?
(Solved)
What is truncation?
Date posted:
November 10, 2017
.
Answers (1)
-
Determine the population of a town four years ago if the present population is 800 000 and the annual population growth rate of the town...
(Solved)
Determine the population of a town four years ago if the present population is 800 000 and the annual population growth rate of the town is 5%.
Date posted:
November 7, 2017
.
Answers (1)
-
A school bursar wishes to obtain the sum of the following amounts of money paid in as school fees for three students by the CDF:...
(Solved)
A school bursar wishes to obtain the sum of the following amounts of money paid in as school fees for three students by the CDF: Ksh 10860, Ksh 49105 and Ksh 7352, the bursar estimates the sum by first rounding each of the amounts to 3 significant figures.
(a) Determine the estimated sum
(b) Determine the percentage error in this estimate
Date posted:
November 7, 2017
.
Answers (1)
-
A solid metal cuboid 1.5 m long, 0.4 m wide and 0.25 m high of material of density 7.5g/cm3. Calculate it's mass in Kilograms. ...
(Solved)
A solid metal cuboid 1.5 m long, 0.4 m wide and 0.25 m high of material of density 7.5g/cm3. Calculate it's mass in Kilograms.
Date posted:
November 7, 2017
.
Answers (1)
-
The marked price of a modern camera is Kes 24, 000. A trader sold it to a customer at a 10% discount. If the trader...
(Solved)
The marked price of a modern camera is Kes 24, 000. A trader sold it to a customer at a 10% discount. If the trader still made a profit of 20% on the cost price, what was its cost price?
Date posted:
November 6, 2017
.
Answers (1)
-
A rectangular water tank has a base measuring 4m by 2.5m. This tank has water to a height of 90cm. Water is then pumped into...
(Solved)
A rectangular water tank has a base measuring 4m by 2.5m. This tank has water to a height of 90cm. Water is then pumped into this tank continuously from 2240 hours to 2330 hours at the rate of 1.2 litres per second. Find the new depth of water in the tank after this period of time giving your results in metres.
Date posted:
November 6, 2017
.
Answers (1)
-
The price of an article was raised by 10% and a week later the new price was lowered by 5%. What was the new price...
(Solved)
The price of an article was raised by 10% and a week later the new price was lowered by 5%. What was the new price if the original price was sh. 100?
Date posted:
October 27, 2017
.
Answers (1)
-
An insurance company reduced its annual premium for a policy by 12.5% to sh. 750. What was the previous amount of premium?
(Solved)
An insurance company reduced its annual premium for a policy by 12.5% to sh. 750. What was the previous amount of premium?
Date posted:
October 27, 2017
.
Answers (1)
-
It cost Robert 150% more to rent his house than it used to 10 years ago when the rent was sh. 15000 per month. How...
(Solved)
It cost Robert 150% more to rent his house than it used to 10 years ago when the rent was sh. 15000 per month. How much rent does he pay now?
Date posted:
October 27, 2017
.
Answers (1)
-
A mason was paid sh. 36000 to completely build a house. What was the total cost of the building if this amount constituted 15% of...
(Solved)
A mason was paid sh. 36000 to completely build a house. What was the total cost of the building if this amount constituted 15% of the cost?
Date posted:
October 27, 2017
.
Answers (1)
-
What percentage is 0.002 cm?
(Solved)
What percentage is 0.002 cm?
Date posted:
October 27, 2017
.
Answers (1)
-
In a quality control survey 4.5% of all parts of a machine were declared sub-standard. If there were 81 sub-standard parts, how many...
(Solved)
In a quality control survey 4.5% of all parts of a machine were declared sub-standard. If there were 81 sub-standard parts, how many parts were analysed?
Date posted:
October 27, 2017
.
Answers (2)
-
David’s shamba is 24 hectares in area six hectares is used for pasture and coffee in the rest. What percentage of his shamba is under...
(Solved)
David’s shamba is 24 hectares in area six hectares is used for pasture and coffee in the rest. What percentage of his shamba is under coffee?
Date posted:
October 27, 2017
.
Answers (1)
-
A shopkeeper bought a cup for sh. 36 and sold it later for sh. 48. What was the percentage gain?
(Solved)
A shopkeeper bought a cup for sh. 36 and sold it later for sh. 48. What was the percentage gain?
Date posted:
October 27, 2017
.
Answers (1)
-
A man pay 10% more for his bus fare from home to work than he used to pay two years ago. If he pays sh....
(Solved)
A man pay 10% more for his bus fare from home to work than he used to pay two years ago. If he pays sh. 40, how much was he paying then?
Date posted:
October 27, 2017
.
Answers (1)