Current location - Training Enrollment Network - Mathematics courses - Eighth grade math problem book 2
Eighth grade math problem book 2
Solution: 1 If the number of donors on the first day is X, then the number of donors on the second day is (x+50).

4800/x=6000/(x+50),

After naming and sorting, 4x+200=5x,

x=200

After testing, x=200 is the solution of the original equation, so x+50=250.

The per capita donation is 4800/x=24,

A:

2. If B walks x kilometers per hour, then A walks (x+0.5) kilometers per hour.

According to the meaning of the question, (2+18)/(x+0.5) =18/x.

Multiply both sides by x(x+0.5), remove the denominator and sort it out. 10x=9x+4.5.

Solution, x=4.5

Solution of test equation

Substitute again, x+0.5=5.

A:

3. it takes x days for group b to complete the project alone.

According to the meaning of the question,1/60 * 20+(1/60+1/x) * 24 =1.

Solution, x=

Is this another question?

The data is wrong.