Lesson eLearning

If a child can write 50 letters in 10 minutes, how many letters can he write in 1 hour 30 minutes?

hard 3 marks Class 1 · Mathematics · Time
Answer
450

The correct answer is 450 — Step 4: The child can write 450 letters in 1 h 30 min.

Step-by-step solution

  1. Step 1: Find the writing rate: 50 letters ÷ 10 min = 5 letters per minute.
  2. Step 2: Convert 1 h 30 min to minutes: 1 h = 60 min, so 60 min + 30 min = 90 min.
  3. Step 3: Multiply the rate by the total minutes: 5 letters/min × 90 min = 450 letters.
  4. Step 4: The child can write 450 letters in 1 h 30 min.
Common mistake: Miscalculating the total minutes or the rate

Concept tested: Proportional reasoning with time

Published · How this solution was prepared and checked

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