X+3Y=84，X+Y=60

Solution: put X+3Y=84,

Decomposition into: X=84-3Y,

Bring in: X+Y=60,

Get: 84-3Y+Y=60,

So it is equal to: 84-2Y=60, 24=2Y, Y= 12,

Bring in: x+y = 60, X+ 12=60, X=48.

Solution: X=48, Y= 12.

Extended data:

What are the general steps to solve application problems?

Step 1: Find out the known conditions and problems. Understand the meaning of the problem through reading and distinguish the known conditions and problems in the problem. ?

Step 2: Analyze the quantitative relationship. After understanding the meaning of the question, we will analyze the known conditions and problems in the application question, mainly to find out the relationship between the known conditions and the known conditions and problems, and determine what to calculate first and then what to calculate according to the clues of these quantitative relations. Learning to analyze the quantitative relationship of application questions is the key to correctly answer application questions. ?

Step 3: Column calculation. According to the solution steps drawn up above, the formulas used for calculation are listed. ?

Step 4: Test the answer. When checking, you must carefully check the original title to see if there are any mistakes in the meaning of the title, copy the wrong numbers, whether the format is required by the title, and whether there are any mistakes in calculation. Check whether the answers are correct. If they are all wrong, correct them in time. This step is very necessary. Attention should be paid to correcting irrelevant questions.