A piggy bank contains $5.45 in dimes and quarters. If the bank contains 29 coins, how many quarters are in the bank?
2 answers:
.1x + .25y = 5.45 x + y = 29 Multiply the second equation by -.1 .1x + .25y = 5.45 -.1x - .1y = -2.9 Now add the equations together, the x's will cancel. ------------------------ .15y = 2.55 Divide both sides by .15 y = 17 29 - 17 = 12 12 dimes and 17 quarters CHECK 12 * .1 + 17*.25 = $5.45
There are 12 dimes in there and 17 quaters
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Step-by-step explanation:
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