Question

How much ice must be added to 100 g water at ${30}^{\circ }C$ in order to reduce its temperature to $20$ Celsius?

• A. 10 g
• B. 80 g
• C. 400 g
• D. None of these

Answer 1

The correct option is A 10 g

Let the mass of ice be $x$

So,

$x\times 80+x\times 20=1000[100\times 10\times 1=1000car]\Rightarrow x=10g$