Posted by **allie** on Tuesday, July 9, 2013 at 1:22pm.

In a class of 80 seniors, there are 3 boys for every 5 girls. In the junior class, there are 3 boys for every 2 girls. If the two classes combined have an equal number of boys and girls, how many students are in the junior class?

- math -
**Steve**, Tuesday, July 9, 2013 at 2:45pm
If there are

3x senior boys and 5x senior girls

3y junior boys and 2y junior girls

3x+3y = 5x+2y

3x+5x = 80

so, x=10

and y=20

juniors have 60 boys and 40 girls.

seniors have 30 boys and 50 girls

- Math -
**???**, Monday, October 26, 2015 at 6:22pm
3+5=8

80/8=10

x=10 YES

b=30 YES

g=50 YES

y=10 NO

b=30 NO

g=20 NO

Because 60 doesn't = 70

y=20 YES

b=60 YES

g=40 YES

Because 90 = 90

S = 30 boys and 50 girls

J = 60 boys and 50 girls

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