Question 706254
P=A+B+C
LET X BE THE SHORTER SIDE (A).
LET X+10 BE THE SECOND SIDE (B).
LET 2X BE THE THIRD SIDE (C).
42=X+X+10+2X
42-10=4X
32=4X
X=32/4
X=8 ANS. FOR THE SHORTEST SIDE (A).
8+10=18 ANS. FOR THE SECOND SIDE (B).
2*8=16 ANS. FOR THE THIRD SIDE (C).
PROOF:
42=8+18+16 
42=42