The ratio of masses of a cubical block of wood and a chunk of concrete is $\frac{3}{5}$ so that the combination just floats with entire volume submerged under water. If specific gravity of wood is $0.5$, then specific gravity of concrete will be
  • A$2.5$
  • B$25$
  • C$15$
  • D$3$
Diffcult
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