In a class of 60 students , 40 % are girls . The average weight of the boys is 62 kg and that of the girls is 55 kg. What is the average weight of the whole class ?
Answers
Answer:
59.2
Step-by-step explanation:
If 40% are girls,
40% of 60 = 24
Therfore, no. Of girls = 24
No. Of boys = 60 - 24 = 36
Average weight of boys = total weight of boys ÷ no. Of boys
That is, 62=total weight /36
Total weight is 62*36 =2232---------(1)
Average weight of girls = total weight of girls ÷ no. Of girls
That is, 55= total weight /24
Total weight is 55*24=1320
For whole class, total weight is 1320 + 2232
=3552
Average weight of whole class is equal to 3552 ÷60 =59.2
Answer:
f 40% are girls,
40% of 60 = 24
Therfore, no. Of girls = 24
No. Of boys = 60 - 24 = 36
Average weight of boys = total weight of boys ÷ no. Of boys
That is, 62=total weight /36
Total weight is 62*36 =2232---------(1)
Average weight of girls = total weight of girls ÷ no. Of girls
That is, 55= total weight /24
Total weight is 55*24=1320
For whole class, total weight is 1320 + 2232
=3552
Average weight of whole class is equal to 3552 ÷60 =59.2