Question

When freezing water increase its volume by $\frac{1}{11}$. By what part of its volume will ice decrease when melts and turns back into water?

• A. $\frac{1}{11}$
• B. $\frac{1}{10}$
• C. $\frac{1}{12}$
• D. $\frac{1}{13}$

Answer 1

The correct option is C $\frac{1}{12}$

Volume of water= $x$

Volume increases by freezing $=\frac{x}{11}$

Ice volume $=x+\frac{x}{11}=\frac{12x}{11}$

Part of ice volume decrease

$=\frac{\frac{x}{11}}{\frac{12x}{11}}=\frac{1}{12}$