Beds

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 answer:

x =  72

Step-by-step explanation:

41=a+b 3a+4b=140  41=a+b 3 a+4 b=140  a+b=41 3a+4b=140  Pivot:Row1Row2 3a+4b=140 a+b=41  Row231 Row1Row2 3a+4b=140 0.33b=5.67  b=0.333333335.66666667=17 a=31404b=31404 17=24  a=24 b=17  x=3 a=3 24=72



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