Question 367756
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Hi,
Let x represent number of dimes.  then (40-x) would be the number of nickels.
5(40-x) + 10x  = 240 cents
200 - 5x + 10x = 240
5x = 40
x = 8, the number of dimes.  Number of nickels would be 32 (40-8)
checking our answer
5*32 + 10*8 = 160 + 80 = 240 cents