Question

10% of what number is 3005% of what number is 72

Answer 1

1)

Given that 10 % of a number is 300.

Let x be the required number.

`10\text{\% of x is 300}`

`10\text{\% }* x=\text{ 300}`

`(10)/(100)* x=\text{ 300}`

`(1)/(10)* x=\text{ 300}`

Multiplying 10 on both sides, we get

`(1)/(10)* x*10=300*10`
`x=3000`

Hence 10 % of 3000 is 300.

2)

Given that 5 % of a number is 72.

Let x be the required number.

`5\text{\% of x is 7}2`

`5\text{\% }* x=\text{ 7}2`

`(5)/(100)* x=72`

`(1)/(20)* x=72`

Multiplying 20 on both sides, we get

`(1)/(20)* x*20=72*20`
`x=1440`

Hence 5% of 1440 is 72.