SOLUTION: A class has 21 students.The ratio of girls to boys is 4:3.How many girls are there in the class?

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Question 314616: A class has 21 students.The ratio of girls to boys is 4:3.How many girls are there in the class?
Found 2 solutions by texttutoring, amikalp:
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
Plane: 0.55*1200 = 660 km

Train: 0.30*1200= 360 km

Remaining percent is 100-(55+30) = 15%

Road: 0.15*1200 = 180 km

Answer by amikalp(1) About Me  (Show Source):
You can put this solution on YOUR website!
50% is 600 K.M & 5% is 60 K.M.(12 x 5)=660 K.M. Travel by Plane
30% is 360 K.M. (120 x 30) is Travel by Train
Now 20% is reaming out of 100%,So 20% is 240(120 x 2) by Transpot.

Your answer is 240 k.m.