SOLUTION: The ratio of boys to girls in a class is 4:5. The number of girls decreases from 20 to 18. What is the new ratio of boys : girls?

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Question 1122433: The ratio of boys to girls in a class is 4:5. The number of girls decreases from 20 to 18. What is the new ratio of boys : girls?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
4x boys and 5x girls
and 5x=20
therefore x=4.
Why?
Because
The number of girls decreases from 20 to 18.

So started with 16 boys and 20 girls.

The NEW ratio is with 2 less girls or
16%2F18
or
8:9 Boys to Girls