Smart chart lists daily temperatures (°C) recorded at noon for five days: Day 1 – 25, Day 2 – 28, Day 3 – 27, Day 4 – 26, Day 5 – ?. The average temperature for the five days is 26.6°C. Find the temperature recorded on Day 5.

Step-by-step solution

1. Add known temperatures: $25+28+27+26=106$.
2. Let $x$ be temperature on Day 5. Average given: $(106+x)/5=26.6$.
3. Multiply both sides by 5: $106+x=133$.
4. Subtract 106: $x=27$.
5. So the temperature on Day 5 is 27°C.

Concept tested: Calculate missing value using average in smart chart

Published 13 October 2026 · How this solution was prepared and checked