A washerman irons 4 shirts in 12 minutes. How many shirts can he iron in one hour?

by

A. 35
B. 20
C. 15
D. 12

🧠 Explanation (Math):

Given: 4 shirts in 12 min; per hour?
Step 1: Shirts/min $=4/12=1/3$.
Step 2: In 60 min $=60/3=20$.
Final Answer: 20