Jack has 3 boxes of pencils with the same number of pencils in each box. his mother gives him 4 more pencils. now jack has 28 pencils. how many pencils are in each box?

Let the number of pencils in each box be x.

Total number of boxes is 3.

Total number of pencils in 3 boxes = x+x+x=3x.

Given His mother gives him 4 more pencils. Now jack has 28 pencils

Or 3x+4=28

To x term 4 is added To isolate x term we subtract 4 both sides .

3x+4-4=28-4

3x=24

To x ,3 is multiplied .Opposite of multiplication is division.

Dividing by 3 both sides

x=8.

Number of pencils in each box is 8.

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

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