Question

b) The sum of twice a number and 4 is 80, find the number.​

Answer 1

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Required number = 38.

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Let the unknown number be x ,

First number = 2x ,

Second number = 4,

First number + Second number = 80 ,

2x + 4 = 80 ,

2x = 80 - 4 ,

2x = 76 ,

x = 76 ÷ 2 ,

x = 38 ,

Therefore  38 is the required number.

Answer 2

Required number = 38.

Let the unknown number be x ,

First number = 2x ,

Second number = 4,

First number + Second number = 80 ,

2x + 4 = 80 ,

2x = 80 - 4 ,

2x = 76 ,

x = 76 ÷ 2 ,

x = 38 ,

Therefore 38 is the required number.