# math

The equation for:
Judy and Linda agree to share the cost
of a \$21 pizza based on how much each one ate. If Judy ate 3/4 of the amount that Linda ate, how much should each pay?

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1. if Linda paid x, then Judy should pay 3/4 x

Add it all together to get the whole cost:

x + 3/4 x = 21
7/4 x = 21
x = 21 * 4/7 = 12

So, Linda paid \$12, Judy paid \$9

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