alleryIn 48 pupils, boys average 64, girls 76, all 69 marks. Number of girls?
A28
B18
C16
D20
Answer & Solution
Correct answer: D. 20
If g is the number of girls, 64(48 − g) + 76g = 69 × 48 gives g = 20.
Keep practising Averages and Data Interpretation
Browse all Averages and Data Interpretation questions for RPF Constable, or explore more Arithmetic topics.
Related questions
Data: combine and interpretRead the displayCompare chart quantitiesMatch the arithmetic resultMatch the arithmetic resultOutput line: days 1,2,3 give 40,60,50; four-day mean 55. Day 3 to 4 rise?Stacked bars P,Q: 6,8 cm; 1 cm=15 items. Red counts: 30,45. Total non-red?Ten scores average 40; remove two averaging 25, add three averaging 50. New mean?