Quantitative Aptitude • Ratio, Average & MixtureMedium
The average weight of 9 students increases by 2 kg when one student weighing 40 kg is replaced by a new student. What is the weight of the new student?
A. 58 kg✓ Correct Answer
B. 18 kg
C. 22 kg
D. 42 kg
💡 Solution & Explanation
If the average rises by 2 kg for 9 students, the total weight rises by 9 × 2 = 18 kg. The only change is the swap, so the new student weighs 18 kg more than the one who left: 40 + 18 = 58 kg.
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