A) \[\frac{1}{5}\]
B) \[\frac{1}{3}\]
C) \[\frac{3}{5}\]
D) \[\frac{2}{5}\]
Correct Answer: C
Solution :
Let the mass of wood and concrete be M and m, respectively. Then \[\frac{M}{0.5}+\frac{m}{2.5}=M+m\] or \[M\left( \frac{1}{0.5}-1 \right)=m\left( 1-\frac{1}{2.5} \right)\] or \[M=m\left( \frac{1.5}{2.5} \right)=m\left( \frac{3}{5} \right)\] \[\therefore \] \[\frac{M}{m}=\frac{3}{5}\] Hence, the correction option is [c].You need to login to perform this action.
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