Question

Allison has 72 coins in her wallet. Some are dimes and the rest are nickels. The total value is $4.90.

Write a system of equations that models this situation where d = number of dimes and n = number of nickels.​

Answer 1

• d + n = 72
• 10d + 5n = 490

Explanation:

Given

• Dime = d = 10c,
• Nickel = n = 5c
• Total coins = d + n = 72
• Total value = $4.90 = 490c

Equations

• d + n = 72
• 10d + 5n = 490