The ave. Score of boys in exam of a school is 71 and that of the girls is 73. The ave. Score of the school in exam is 71.8. Find the ratio of no. Of boys to no. Of girls who appeared in the exam.
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1
12:8 it means that if there are 20 students then 12 are boys and 8 are girls
Answered by
2
71*b+ 73*g=71.8*(b+g)
71b+73g=71.8b+71.8g
71.8b-71b=73g-71.8g
0.8b=1.2g
b=12. g=8
71b+73g=71.8b+71.8g
71.8b-71b=73g-71.8g
0.8b=1.2g
b=12. g=8
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