Find the value of triangle and circle
According to the meaning of the question, the following equations can be listed.
{2△+○=42①
{△+○=25②
Here we can get an equation from ①-②.
△= 17
So the value of △ is 17.
Next, you can substitute △= 17 into ② (or ①, of course) to get another equation.
17+○=25
Minus 17 on both sides, so.
○=8
So the value of △ is 17, and the value of △ is 8.
If you don't understand, you can ask.