If the first number is 20% less than the third number and the ratio of the second to the third number is 7:10, then the average of the first and the third number is how much percent more than the second number?
A.26 4/7
B.24 2/7
C.28 2/7
D.28 4/7✓ Correct
Explanation
Let third number = 10x, first = 8x, second = 7x. Average of first and third = 9x. Required % = (9x−7x)/7x × 100 = 200/7 = 28 4/7%.
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