Multiple choice

4 boys and 3 girls spent Rs. 120 on the average, of which boys spent Rs. 150 on the average. Then the average amount spent by the girls is -

  1. Rs. 80

  2. Rs. 60

  3. Rs. 90

  4. Rs. 100
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let girls' average be g. Total spent by all 7 people = 7 × 120 = 840. Boys' total = 4 × 150 = 600. Girls' total = 840 - 600 = 240. Girls' average = 240/3 = 80. This matches option A. The weighted average formula confirms: (4×150 + 3×g)/7 = 120, giving g = 80.

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