Question

Word problem: Sam has 30 nickels and dimes worth $2.40. How many nickels does he have?

My problem: I am having trouble making this into an equation. I don't need help solving it, just making the equation. That's all

Answer 1

In terms of n for nickles and d for dimes what would the equation look like for number of coins?

Answer 2

I have no clue at the moment. In fact I'm having the worst brain fart ever.

Answer 3

How many coins do you have?

Answer 4

30

Answer 5

So n+d = 30 this would be your first equation as it represents the number of coins. Do you understand?

Answer 6

Oh! yes, yes I do now! Now I remember what to do. Thanks

Answer 7

How will you write the second equation?

Answer 8

ummmm, d+2.40+d=30? Oh great, now i think I'm brain farting again. maybe

Answer 9

I was just going by an example I have in my notes

Answer 10

It has to equal $ 2.40

Answer 11

How much is a dime worth and how much is a nickel worth?

Answer 12

a nickle=5 cents and a dime= 10 cents

Answer 13

Or .05 and .10.. So we need an equation that represents the number of nickels times .05 + the number of dimes times .10 = $ 2.40..so it will look like what?

Answer 14

.05n+.10d=2.40

Answer 15

Excellent. To solve you will use substitution

Answer 16

Okay, so then I would change it to look like .05n+.10(n+30)=2.40
which will be n=$19.84. I think. I'm pretty sure