A) 20
B) 25
C) 101
D) 29
Correct Answer: B
Solution :
\[a:b=4:1\] Let the ratio of a and b be \[x\]and \[4x\] \[\sqrt{ab}=10\] \[ab=100\] \[x\times 4x=100\] \[4{{x}^{2}}=100\] \[{{x}^{2}}=\frac{100}{4}\] \[{{x}^{2}}=25\] \[x=25\] Then \[a=5,\text{ }b=4\times 5=20\] \[\therefore \]\[a+b=25\]You need to login to perform this action.
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