A shopkeeper 5

A shopkeeper sold some sets of Pencils and Pens. Each set contained 6 pencils and 2 pens. If the shopkeeper sold 112 pencils and pens, how many pens did she sell altogether?

Correct answer:

a =  28

Step-by-step explanation:

a:b=2:6 a+b = 112  a+b=112 6a=2b  a+b=112 6 a=2 b  a+b=112 6a2b=0  Pivot:Row1Row2 6a2b=0 a+b=112  Row261 Row1Row2 6a2b=0 1.33b=112  b=1.33333333112=84 a=60+2b=60+2 84=28  a=28 b=84

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