# math

Bill has 30 coins, some nickels some dimes. They equal \$2.10. How many nickels are there? What is the equasion used to solve this problem?

Let d=# dimes.
let n=# nickels.

d + n = 30
d(\$.10) + n(\$.05) = \$2.10

Two equations and two unknowns. Solve them simultaneously.

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