Multiple choice general knowledge math & puzzles

A solved 24 maths problems in 15 minutes at this rate how many problems can she solve in 40 minutes?

  1. 61

  2. 64

  3. 54

  4. 51
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If A solves 24 problems in 15 minutes, her rate is 24/15 = 1.6 problems per minute. In 40 minutes, she can solve 1.6 × 40 = 64 problems.

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