send me it's solution

120

A=2C A+B=15 B+C=24 Lcm of 15 and 24 =120 A+B 1 day work=8 -(i) B+C 1 day work=5-(ii) Subtracting i and ii (A+B)-(B+C) =8-5 A+B-B-C =3 A-C =3 (putting value of A=2C) 2C-C =3 C=3 Putting C =3 in eq ii B+3=5 B=2 B working days= 120/2=60