Primary school math problems, to write the calculation process, as many as you can answer.

1 60 is 20% more than that?

The solution number is 60÷( 1+20%)=50.

2. Several teams play a group match, and every two teams have a match. As a result, I played 15 games. Find out how many teams there are.

Set the solution to n groups, where n > 0.

Then n(n- 1)/2= 15.

That is, n(n- 1)=30.

The solution is n=6.

3. The minuend, the sum of the minuend and the difference is 180, and the minuend is twice the difference. What is a minuet?

solution

Negative+negative+difference = 180

Minus =2 times difference

Negative+negative = difference

Difference = subtraction,

That is 2××+ difference+difference = 180.

That is, the difference =45.

So subtraction = difference =45