Question 33249
Let number of Nickels be N
and Number of dimes be D
given 0.05(D)+ 0.10(N) = 1.15
ALso given N = 2+D
so (5/100)D +(10/100)N = 1.15
5D + 10N = 115
substitute the value of N 
5D + 10(2+D) = 115
5D + 20 +10D = 115
15D = 105
D = 7
N = 7+2 = 9
THerfore Number of Dimes = 7
Number of Nickels = 2