In a group of 7 students, 4 boys and 3 girls spent an average of ₹120 each. If the average spending of the boys was ₹150, what was the average spending of the girls?
Show answer & explanation
Correct answer: C
Explanation
Given:
Total students = 7
Boys = 4, Girls = 3
Average total expenditure = ₹120
Average expenditure of boys = ₹150
Formula:
Sum = Average × Number
Total expenditure = 7 × 120 = 840
Total expenditure of boys = 4 × 150 = 600
Total expenditure of girls = 840 − 600 = 240
Average expenditure of girls = 240 / 3 = ₹80