First, u find conman denominator which is 15 so 2/5=6/15 & 1/3=5/15, which adds up to 11/15, so the remaining fraction that kendrs has to wash is 4/15
The Answer is B.
2.97/8= .371
3.25/10= .325
4.10/12= .342
5.80/16= .366
This means you can get 1 board for $0.325 when buying 10 boards.
You need to get the r by itself on one side, with the constants (numbers without the r) on the other side.