Question 107545
A collection of 40 dimes and nickels is worth $2.90. How many nickels are there?
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Let # of dimes be "d" ; Value is 10d cents
# of nickels is "40-d" : value is 5(40-d)= 200-5d cents
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EQUATION:
value + value = 290 cents
10d + 200-5d = 290
5d = 90
d= 18 (# of dimes)
40-d= 22 (# of nickels)
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Cheers,
Stan H.