A) 90
B) 100
C) 180
D) 150
Correct Answer: D
Solution :
Suppose three numbers are x, 2x and 3x. Then, \[x+2x+3x=3\times 600\] \[6x=3\times 600\] \[x=300\] Now, \[A=\frac{300\times 110}{100}=330\] \[B=\frac{2\times 300\times 80}{100}=480\] \[Average=\frac{600\times 105}{100}=630\] Hence, C should be increased by \[=3\times 630-(330+480)-3\times 300\] \[=3\times 630-810-900\] \[=1860-1710\] \[=150\]You need to login to perform this action.
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