Question

Peter think of a number. He multiplies it by 5 then subtract 10. The answer is the same as 2 times the number plus 11.
Write an equation to represent the problem.
Find the value of the unknown number.

Answer 1

Answer:

The equation will be :-

( x × 5 ) - 10 = ( 2 × x ) + 11

5x - 10 = 2x + 11

and the value of unknown number is

5x - 2x = 11 + 10

3x = 21

x = 21/3

x = 7

The number is 7 .

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