Answer: $6.50
Justification:
Work backward step by step.
1) Total bill: $125 given
2) Value of five scarves: multiply the number of scarves time the unit price
5 * $12.00 = $ 60.00
3) Value of the socks: subtract the value of the scarves from the total bill
$ 125 - $ 60 = $65
4) divide $65 by the total number of pair of socks
If each bought two pairs, the total number of pairs is 5 * 2 = 10
So, the price of one pair is $65 / 10 = $6.50
Now, you can verify:
- two pairs of socks each sister * 5 sisters = 10 pairs
- 10 pairs of socks at $6.50 each = 10*$6.50 = $ 65
- Five scarves at $ 12 each = 5 * $12 = $ 60
- Total bill = $ 65 + $ 60 = $ 125 => check.
