<PRE><B>Question 337422</B>
nickels =N
dimes =D
total number of coins =18
N+D=18
N=18-D -----------(1)
total nickels and dime  is 1.45
5N+10D = 145 --------------(2)
substitue the value of N in(2)
5(18-D)+10D= 145 
5*18 -5D +10D =145
90 +5D=145
5D=145-90
5D=55
D=11
N+D=18
N+11+18
N=7
there are 7 nickels and 11 dimes
Proof:
5N+10D=145
5*7 +10*11=145
35+110=145
145=145</PRE>