Step-by-step explanation:
i believe it's a ratio question? R to D:D to P is in the same ratio as R to C:C to A
so 15+42 = 67
(67÷15)x100 will give you what percent D to P is of R to P this value is also the percentage of length that A to C is out of A to R.
Use this to say 10 units is (the worked out) percent of A to R, find 100 percent of A to R
then find the value of R TO C (X) by taking the original percentage and minusing that from 100, then use this to find the value of C to R due to its percent of A to R
sorry if it's badly worded :)
