Question

If 20% of 40 % of a = 25 % of a % of b , then what is b

Answer 1

Concept:

Here, we have will do some simple multiplication and division.

Given:

20% of 40 % of a = 25 % of a % of b

To find:

b

Solution:

If 20% of 40 % of a = 25 % of a % of b then we can write it as

$\frac{20}{100} * \frac{40}{100} *a = \frac{25}{100} *\frac{a}{100} *b$

so if we solve this equation then we get,

$\frac{800}{10000} * a =\frac{25a}{10000} *b\\800*a=25*a*b\\800a=25ab$

If we leave b on the right-hand side, then we get

$\frac{800a}{25a}=b\\ 32=b$

Hence, the value of b is 32.

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