Question

If you know 40% of a number,explain how you could work out the original number

Answer 1

help me :(((((((

Answer 2

suppose you know that 40% of a number is 60
Let the original number be x

.40x = 60
x = 60/.40 = 150
So the number was 150

check:
take 40% of 150
= 40/100 * 150 , (* means multiply)
= 2/5*150
= 300/5
= 60 , ok then!

so in effect just divide your given result by .40
(or whatever the given percent is,
note 40% = .40 , 35% = .35 etc)

Answer 3

n = your number

40% = 40 / 100 = 0.4

If you know 40% of a number you know 0.4 n

Mark 40% of your number with x

x = 40% n

x = 0.4 n

Divide bith sides by 0.4

x / 0.4 = n

2.5 x = n

n = 2.5 x

So, if you know 40% of a number multiply it by 2.5 and you get the required number.