Question

The average temprature of first $4$ days of a week is ${35}^{\circ }C$ and that of the last $3$ days is ${42}^{\circ }C$. The average temperature of the week is

• A. ${39}^{\circ }C$
• B. ${38}^{\circ }C$
• C. ${40}^{\circ }C$
• D. ${37}^{\circ }C$

Answer 1

The correct option is B ${38}^{\circ }C$

Average $=\frac{4\times 35+3\times 42}{4+3}$
$=20+18={38}^{\circ }C$