1.

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

Answer»

Let the number be x. 

Twice the number = 2x 

Sum of twice a number and 4 = 80 

2x + 4 = 80 

⇒ 2x + 4 – 4 = 80 – 4(Subtract 4 on both sides) 

⇒ 2x = 76

⇒ 2x/2 = 76/2 (Divide by 2 on both sides) 

⇒ x = 38 

∴ Number = 38



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