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Application problems of fifth grade in primary school
1, Team A completed one tenth, Team B completed one twelfth and Team C completed one fifteenth in one day. How many parts of the whole project can be completed by three pairs of cooperation in one day?

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).