At the summer camp, there are 41 chalets. Some rooms are 3-beds, some 4-beds. How many campers from 140 are living in 3-bed?

Correct result:

x =  72


 41=a+b 3a+4b=140  41=a+b 3 a+4 b=140  a+b=41 3a+4b=140  a=24 b=17  x=3 a=3 24=72

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