Math
posted by Cat .
On a Christmas package, Audrey needs to use only 40cent stamps and 16cent stamps. If she uses twice as many 40cent stamps as 16cent stamps, how many of each type of stamp must she use to mail a package costing $5.76 in postage?

Let x = .16 stamps and y = .40 stamps.
y = 2x
.16x + .40y = 5.76
Substitute 2x for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.
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