1/3x = 1/2( 120-x)
1/3x=60- 1/2x
1/3x+ 1/2x=60
5/6x=60
x=72
120-x= 120-72=48 (pieces)
A: Class One is assigned to 72, and Class Two is assigned to 48.
2. Solution: Suppose A has x tons, then B has (420-x) tons.
25% x+ 1/3(420-x)= 125
25% x+ 140- 1/3x = 125
- 1/ 12x = 125- 140
- 1/ 12x=- 15
x= 180
420- 180=240 (ton)
A: A 180 tons, B 240 tons.