Q. |
If a % of b + 4 % of ab = 15% of (a+b), then what is the value of 1/a + 1/b ? |
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A. 1/2 |
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B. 1/5 |
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C. 1/4 |
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D. 1/3 |
a % of b + 4 % of ab = 15% of (a+b)
ab/100 + 4 * ab/100 = 15 * (a+b) /100
5 * ab / 100 = 15 * (a+b) / 100
a + b / ab = 1/3
1/ a + 1/b = 1/3