Question

0.5% of what number is 5?

Answer 1

Let us call the unknown number "unknown number". Then we know that 0.5% of the number is 5, in other words

`(0.5)/(100)* unknown\text{ number = 5}`

multiplying both sides by 100 gives

`100*(0.5)/(100)* unknown\text{ number = 5}*100`
`0.5* unknown\text{ number = }500`

and then dividing both sides by 0.5 gives

`(1)/(0.5)*0.5* unknown\text{ number = }(500)/(0.5)`
`unknown\text{ number = }(500)/(0.5)`
`unknown\text{ number = }1000.`

Hence, 0.5% of 1000 is 5.