Posted by **Laurie** on Saturday, April 4, 2009 at 12:50pm.

Lianne has nineteen coins worth $1.45. Some coins are dimes & the rest are nickels. How many dimes does she have.

I understand the D + N = 19 & the 10D + 5N = 145, but I don't understand how you'd subtract them from each other?

- Math -
**Reiny**, Saturday, April 4, 2009 at 12:54pm
I answered that same question last night

divide the second equation by 5

2d + n = 29, now put the first underneath it

d + n = 19

subtract

d + 0 = 10

so there were 10 dimes, and from the first equation n=9

so there were 9 nickels

check: is 10+9 = 19 ? yes

value: 10 dimes = $1.00

9 nickels = 0.45

totol $1.45

- Math -
**anna lona**, Saturday, April 4, 2009 at 2:07pm
5645323

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