A class had 14 boys with an average height of 5.3 feet. A new boy joined the class. Now the average of the 15 boys in the class was 5.25 feet. How tall was the new boy?

by

A) 5.55 feet
B) 4.55 feet
C) 3.55 feet
D) 2.55 feet

🧠 Explanation (Math):

Given: 14 boys average = 5.3 ft; after adding one boy, 15 boys average = 5.25 ft
Step 1: Old total height = 14 × 5.3 = 74.2 ft
Step 2: New total height = 15 × 5.25 = 78.75 ft
Step 3: New boy’s height = 78.75 − 74.2 = 4.55 ft
Final Answer: 4.55 feet