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Grade two olympiad math problem: score
In a math exam, Xiaoling and Xiaojun got 195, Xiaoling and Xiao Fang got 198, Xiaojun and Xiao Fang got 193. How many points did they get?

Solution: List the following equations:

Xiaoling+Xiaojun = 195 (1)

Xiaoling+Xiao Fang = 198 (2)

Xiaojun+Xiao Fang = 193 (3)

Add the left and right terms of the three equations respectively to obtain:

2× (Xiaoling+Xiaojun+Xiao Fang) =586

That is Xiaoling+Xiaojun+Xiao Fang =293 (4).

Derived from formula (4) -( 1)

Xiao Fang =293- 195=98.

Derived from formulas (4) -(2)

Xiaojun =293- 198=95

Derived from formulas (4) -(3)

Xiaoling =293- 193= 100

It can be seen that Xiao Fang got 98 points, Xiao Jun got 95 points and Xiao Ling got 100 points.