Answer,
= 4
Explanation,
So, basicly they want you to put the numbers (1/5) & (15) in place of the letters (c) & (d). Let's do that,
5 * 1/5 + 1/5 * 15
So, now that we have replaced the letters with numbers we simply simplify,
5 * 1/5 = 1
1/5 * 15 = 3
3 + 1 = 4
Hope this helps :-)
