78 school students graduate from mathematics or physics. There are three times more students who graduate from mathematics and do not graduate from physics than those who graduate from physics and do not graduate from mathematics. 69 students graduate from mathematics. How many students graduate from mathematics and physics?

Correct result:

p =  42

#### Solution:

m+f+p=78
m=3f
m+p=69

m+f+p=78
m=3•f
m+p=69

f+m+p = 78
3f-m = 0
m+p = 69

f = 9
m = 27
p = 42

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