A) 7
B) 14
C) 21
D) 35
Correct Answer: C
Solution :
Given 9,x,x, 49 are in proportion. \[\Rightarrow 9\times 49=x\times x\] \[\Rightarrow 3\times 3\times 7\times 7=x\times x\] \[\Rightarrow (3\times 7)\times (3\times 7)=x\times x\] \[\Rightarrow x=3\times 7=21\]You need to login to perform this action.
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