Emma bought some necklaces and rings for her friends. The price of each necklace was $3.70 while the price of each ring was $11.60. For every 7 rings bought, she was given one such necklace for free. After receiving the free necklaces, the number of necklaces was
14 of the number of rings bought. If Emma paid a total of $2015.40, how much more did she pay for the rings than the necklaces?
Rings |
Necklaces |
4x7 |
1x7 |
Bought |
Free |
Bought |
7x4 |
1x4 |
|
28 u |
4 u |
3 u |
|
Rings |
Necklaces |
|
Bought |
Free |
Bought |
Number |
28 u |
4 u |
3 u |
Value |
$11.60 |
0 |
$3.70 |
Total value |
324.8 u |
0 |
11.1 u |
The number of rings bought is the repeated identity. Make the number of rings bought the same. LCM of 4 and 7 is 28.
Cost of the bought rings
= 28 u x 11.60
= 324.8 u
Cost of the bought necklaces
= 3 u x 3.70
= 11.1 u
Total cost of the bought items
= 324.8 u + 11.1 u
= 335.9 u
335.9 u = 2015.40
1 u = 2015.40 ÷ 335.90 = 6
Amount that she paid more for the rings than the necklaces
= 324.8 u - 11.1 u
= 313.7 u
= 313.7 x 6
= $1882.20
Answer(s): $1882.20