What number should be added to each of 7, 16, 43, 79 so that they form a proportion? 7, 16, 43, 79 में से प्रत्येक में कौन सी संख्या जोड़ी जानी चाहिए ताकि वे समानुपात में हों?
A
2 (2)
B
3 (3)
C
5 (5)
D
7 (7)
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Correct Answer 5
Explanation
Let x be added. (7+x)/(16+x) = (43+x)/(79+x). Solving this gives x=5. (Check: 12/21 = 48/84 = 4/7).