SOLUTION: the total value of nickels and dimes is $ 2.20 . There are 36 coins in all . Write an equation which gives the number of dimes , d .

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Question 556329: the total value of nickels and dimes is $ 2.20 . There are 36 coins in all . Write an equation which gives the number of dimes , d .
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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the total value of nickels and dimes is $ 2.20 .
There are 36 coins in all . Write an equation which gives the number of dimes , d .
:
n + d = 36
d = 36 - n
and
.05n + .10d = 2.20
.10d = 2.20 - .05n
multiply eq by 10
d = 22 - .5n