Question

if P and Q is 12 cm and P and S 5 cm what would be the value of S and R

Answer 1

do you have more information? what is the shape of this figure or the relationship between S and R

Answer 2

P + Q = 12
P + S = 5
2 P + Q + S = 17
Q - S = 7 ; S = Q - 7
S = 17 -(2 P + Q) = 17 - 2 P - Q
Q - 7 = 17 - 2 P - Q
2 Q = 24 - 2 P
Q = 12 - P
P - Q = -2

so S = Q - 7 and no idea where R fits in