Children 82684

Pupils on ski training lived in 29 rooms, some of which were 4-bed, others 5-bed. How many were there when there were 120 children?

Correct answer:

a =  25
b =  4

Step-by-step explanation:

a+b=29 4a+5b=120  a+b=29 4 a+5 b=120  a+b=29 4a+5b=120  Pivot:Row1Row2 4a+5b=120 a+b=29  Row241 Row1Row2 4a+5b=120 0.25b=1  b=0.251=4 a=41205b=41205 4=25  a=25 b=4

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