Question 294333
k = 2s
k = m - 10
m = 2s + 10 
k + m + s = 90

/************************************/
k + s + 2s + 10 = 90
2s + s + 2s + 10 = 90
5s + 10 = 90
5s = 80 
s = 16

k = 32
m = 42
and bob's your uncle!