n+d = 45
5n + 10d = 360 or n + 2d = 72
so...
n+d = 45
n + 2d = 72
subtract them to eliminate the n , then solve for d
sub d back into the first and all is easy.
Write a system of equations to model the problem and solve the system:
Benjamin has nickels and dimes and his toy bank he has a total of 45 coins the total value of $3.60. How many coins of each kind does he have?
1 answer
3 answers