1/ 10+ 1/ 12+ 1/ 15
=6/60+5/60+4/60
= 15/60
= 1/4
The transport team carried a batch of cement, the first time it brought in four 20 tons, four 15 tons less than the second time. How many tons are brought in twice?
Second shipment = 4/20+4/15 =12/60+16/60 = 28/60.
Two * * * shipments: 4/20+28/60 = 40/60 = 2/3 (two thirds).
3 transport a pile of muck, the car carries two-fifths of this pile of dirt, and the cart carries seven-fifths more than the car.
One, how much is left?
Shopping cart =2/5+ 1/7= 19/35
The rest:1-(2/5+19/35) =1-33/35 = 2/35 (2/35).