1.

If we add 7 to twice a number, we get 49. Find the number.

Answer»

Let the number be x 

Then twice the number = 2x 

On adding = 2x + 7

By problem, 2x + 7 = 49 

2x = 49 – 7 (transposing + 7) 

2x = 42

x =42/2 (transposing x 2) 

x = 21



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