Question

if 3% of (a+b) = 7% of (ab) and 5% of (a-b). then what % of b is a? ​

Answer 1

Step-by-step explanation:

3% of (a+b) = 7% of (ab) = 5% of (a-b)

or, 3(a+b)/100 = 7ab/100 = 5(a-b)/100

or, 3(a+b) = 7ab = 5(a-b)

now,

3a+3b = 5a - 5b

or, -2a = -8b

or, a = 4b.

or, b × 400/100 = a

or, b × 400% = a.

so,

400% of b is a

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