in a class of 20 girls and 15 boys the average weight of the class is 42 kg the average weight of the voice is 41.5 what is the average weight of the girls
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0.5 girls weight mera answer sahi hoga to batana
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let the total weight of boys and girls be X and Y respectively
avg. weight of class=total weight of students
total number of students
42= X+Y/20+15
42 = X+Y/35
42×35=X + Y
X+Y= 1470.........(1)
avg weight of boys = total weight of boys
number of boys
41.5=X/15
41.5×15= X
X=622.5........(2)
put equation 2 in 1
622.5+Y =1470
Y=1470-622.5=847.5
avg weight of girls = total weight of girls
total number of girls
= 847.5/20
= 42.375
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