Question

The average temperatures of Tuesday, Wednesday and Thursday was ${42}^o$C. The average temperature of Wednesday, Thursday and Friday was ${47}^o$C. If the temperature of Tuesday was ${43}^o$C, then the temperature on Friday was _________.

• A. ${58}^o$C
• B. ${50}^o$C
• C. ${53}^o$C
• D. ${49}^o$C

Answer 1

The correct option is A ${58}^o$C

Average of temperatures of Tuesday, Wednesday and Thursday $={42}^{\circ }C$

Average of temperatures of Wednesday, Thursday and Friday $={47}^{\circ }C$

$\Rightarrow$ Sum of temperatures of Tuesday, Wednesday and Thursday $={126}^{\circ }C$

$\Rightarrow$ Sum of temperatures of Wednesday, Thursday and Friday $={141}^{\circ }C$

$\therefore$ Temperature of Friday $-$ Temperature of Tuesday $=141-126={15}^{\circ }C$

$\therefore$ Temperature on Friday $={58}^{\circ }C$