Question

Martha went shopping & bought each of her five nephews a gift, either a video costing $14.95 or a CD costing $16.88

She spent $76.88 on their gifts.
How many videos & How many CD's did she buy?

Answer 1

v+c=5
14.95v+16.88c=76.88
Multiply the second equation to get rid of the decimals
Replace v in the second equation with 5-c from the first equation and solve.

I believe it was 10 nephews last night.

Answer 2

It wasn't me. This is my 1st day on this group.
Please, go check original poster from last night!

Answer 3

I still don't get it.

Answer 4

Did you multiply the second equation by 100 to get rid of the decimals?

Answer 5

(100)14.95v + (100)16.88c = (100)76.88
1495v + 1688c = 7688

Is that right?

Answer 6

Yes.

Answer 7

Now from the first equation, v=5-c
replace v with 5-c and solve

Answer 8

1495v + 1688c = 7688
1495(5-c) + 1688c =7688
7475-1495c+1688c=7688
7475-193c=7688
-7475 -7475

-193c=213

Is that right?

Answer 9

7475-193c=7688
Should be 7475+193c

Answer 10

I got the 7475+193c=7688 I messed up my signs

7475+193c=7688
-7475 -7475
193c=213
c=1.10

Answer 11

Are you sure you copied the problem right? It should come out to be a whole number of videos and cd's. Someone posted this same problem last night and I thought it was 10 nephews. Please check the problem.

Answer 12

let me check

Answer 13

Her total is $76.68 not 76.88 as I posted,

Answer 14

That works

Answer 15

1495v + 1688c = 7668
1495(5-c) + 1688c =7668
7475-1495c+1688c=7668
7475+193c=7668
-7475 -7475

193c=193

So she bought 1 CD

Answer 16

Yes and 4 videos

Answer 17

Thank u

Answer 18

yw

Answer 19

It makes sense. I have trouble setting up application problems.

Answer 20

Everyone does in the beginning. The key is to keep practicing.

Answer 21

How do we give medals? I am new. I would like to give u a medal