# math

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For her vacation Mrs. Andrews bought \$300 worth of traveler's checks in \$10 and \$20 denominations. If she has 22 travelers checks in all, how many of each denomination does she have?

Let x represent the number of \$10 traveler's checks she has. Which expression represents the value of the \$20 traveler's checks she has?

• math -

number of 10's --- x
number of 20's ---- 22-x

10x + 20(22-x) = 300
10x + 440 - 20x = 300
-10x = -140
x = 14

She bought 14 10's and 8 20's

check: 14+8 = 22 check!
10(14) + 20(8) = 300 check!

BTW, time to update that textbook, I wonder how many people under 30 would even know what a traveler's check is.

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