A) 3
B) 4
C) 5
D) 6
Correct Answer: B
Solution :
\[\frac{(x+2)\times 60+x\times 120+(x-2)\times 180}{(x+2)+x+(x-2)}=100\] \[\Rightarrow \] \[\frac{360x-240}{3x}=100\] \[\Rightarrow \] \[60x=240\Rightarrow x=4\]You need to login to perform this action.
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