1.4/7X - 1/8X =36
You didn't say it for long. Maybe he worked all day.
3.X - ( 25%X + 30%X) = 162
4. Let A be X and B be (140-X).
12.5% X+( 140-X)= X- 12.5% X
5. What are your requirements? The same volume or the same surface area.
The square of (20 schools) x = 10 The square of the schools is multiplied by 20.