Question

A long playing record revolves hundred times every three minutes how many revolutions does it make in 2.25 minutes how long does it take for 275 revolutions

Answer 1

75 revolutions

8.25minutes

Explanation:

If a long playing record revolves hundred times every three minutes, this can be written as;

100 revolution = 3minutes

To calculate the amount of revolution it will make in 2.25 minutes, we can write;

x = 2.25 minutes

Divide both expressions;

100/x = 3/2.25

3x = 100 * 2.25

3x = 225

x = 225/3

x = 75

Hence it can make 75 revolutions in 2.25 minutes

To determine how long it take for 275 revolutions, we can write;

275 revolutions = y

Recall that: 100 revolution = 3minutes

Divide;

275/100 = y/3

100y = 3 * 275

100y = 825

y = 825/100

y = 8.25

Hence it takes 8.25 minutes