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Find out five math problems in life
1. To transport 29.5 tons of coal, transport it three times by a truck with a load of 4 tons, and transport the rest by a truck with a load of 2.5 tons. How many times will it take to complete?

It takes x times to complete.

29.5-3 * 4 = 2.5 times

17.5=2.5x

x=7

Seven more shipments are needed to complete.

2. The trapezoidal site covers an area of 90 square meters, with an upper bottom of 7 meters and a lower bottom of 1 1 meter. How high is it?

Its height is x meters.

x(7+ 1 1)=90*2

18x= 180

x= 10

Its height is 10 meter.

A workshop plans to produce 5480 parts in April. It has been in production for 9 days, and 908 more are about to complete the production plan. How many pieces will be produced on average every day in these 9 days?

During these 9 days, X was produced every day on average.

9x+908=5408

9x=4500

x=500

During these nine days, an average of 500 were produced every day.

4. Two cars, Party A and Party B, are driving in opposite directions from two places 272km apart. Three hours later, the distance between the two cars is still 17km. A travels 45 kilometers per hour, and B travels how many kilometers per hour?

B travels x kilometers per hour.

3(45+x)+ 17=272

3(45+x)=255

45+x=85

x=40

B is driving at a speed of 40 kilometers per hour.

5. There are two classes in grade six in a school, and the average score of mathematics last semester is 85. There are 40 students in six classes (1) with an average score of 87. 1. There are 42 students in Class Six (2). What is the average score?

The average score is X.

40*87. 1+42x=85*82

3484+42x=6970

42x=3486

x=83

The average score is 83 points.