1, 96kg barrel oil a and 24kg barrel oil b. Take out 3kg from barrel A every day and pour it into barrel B. After a few days, the oil in barrel B is three times that of barrel A?

(96-3X)×3=24+3X X=22

2. The first clothing factory planned to produce a batch of clothes with 2.2 meters of cloth each, but actually only 2 meters were used for each set, which not only made 10 more clothes, but also saved 32 meters of cloth. How many sets of clothes does it plan to produce?

2.2X-32=2×(X+ 10) X=260

The express train and the local train leave from A and B respectively at the same time, and drive in opposite directions. The whole train runs at a speed of 28 kilometers per hour. Six hours later, two trains meet. It takes three hours for the express train to reach B. How many kilometers is the local train from A?

6+3 = 9 1/9× 6 = 2/3 ( 1-2/3) ÷ 6 = 1/ 18 28 ÷ 1/ 18 = 404.

4. Master and apprentice process 750 parts at the same time. The master can finish the task in six days and then the apprentice in three days, or the apprentice can finish the task in five days and then the master can finish it in five days. How many parts does the apprentice process every day?

(6-5): (5-3) =1:2 750 ÷ (6× 2+3) = 50 (pieces)

5. For a right-angled trapezoid, the length of the lower bottom is twice that of the upper bottom. If the upper bottom is increased by 4 cm, it becomes a square. How many square centimeters is the area of this right-angled trapezoid?

(4+4×2)×(4×2)×2 = 48 (square centimeter)

6. The trapezoidal ABCD has an area of 45 square meters and a height of 6 meters, of which the triangular AED has an area of 5 square meters and BC= 10 meter. Find the shadow area?

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