The little ape found himself with a dime and a dime. * * How many coins are there whose total amount of money is 8 yuan?

Problem solving process:

1, so that the ape has 1 X and Y.

2.20 yuan 1 and 5 dimes * *, that is, X+Y=20.

3. The total amount of money is 8 yuan money, that is, 0. 1X+0.5Y=8.

4. Convert X+Y=20 into X=20-Y, and substitute 0. 1X+0.5Y=8 to get Y= 15.

5. Substitute Y= 15 into X+Y=20 to get X=5.

Expand the idea of solving problems with data:

1, when there are unknowns in the topic, use letters instead of listing equations.

2, according to the known conditions, find out the relationship between the unknowns, taking the topic as an example, 1 and 50 coins ***20, you can use the substitution method, and replace another unknown with one unknown. ?

3. After the numerical convergence is completed, simplify it to the simplest way and calculate the corresponding numerical value. ?

4. Substitute the numerical results into the original formula for checking calculation.