4X+Y=60

When X= 14

Y=4

Z=2

X= 13 does not meet the requirements.

You can list inequalities to find groups.

x+Y = & lt； 20

4X+Y=60

Solve the equation,

You got it right 14.

If you haven't studied equations, take a look at this:

Answer: If you answer question X correctly and question Y incorrectly, you will get the following equation:

4X-Y=60

X+Y=20

X= 16，Y=4。

Mao Mao got it right 16.