Question 24666
ok,
number of dimes = d
number of nickels = n
so
Megan has 7 more dimes than nickels
-->>   d = n + 7
Megan has a total of $1.60
-->>   (.10)d + (.05)n = $1.60
pluggin 'n+7' in for 'd'
-->>   (.10)(n+7) + (.05)n = 1.60
-->>   .10n + .70 + .05n = 1.60
-->>   .15n + .70 = 1.60
-->>   .15n = .90
-->>      n = 6
-->>    d=n+7=13