a number that i choose

Algebra Level 1

A student chose a number, multiplied it by 2, then subtracted 138 from the result and got 102. What was the number he chose?


The answer is 120.

Lorenz Navales by lorenz navales , 21, Philippines

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2 solutions

Hung Woei Neoh
Apr 23, 2016

Say the student chose a number x x

2 x − 138 = 102 2 x = 240 x = 120 2x-138=102\\ 2x=240\\ x=\boxed{120}

2 Helpful 0 Interesting 0 Brilliant 0 Confused

Petfect solution. (+1)

Ashish Menon - 5 years ago
Lorenz Navales
Apr 21, 2016

Let x be the number he chose, then 2⋅x−138=1022⋅x−138=102 2x=2402x=240 x=120

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Nice problem!

Your equations are difficult to understand. I would suggest that you begin new equations in a new line. To go to a new line, press enter (or return key) twice.

Pranshu Gaba - 5 years, 1 month ago

Yuor solution would look cool with LaTeX \LaTeX . Why dont you use it? ⌣ ¨ \ddot\smile

Ashish Menon - 5 years ago

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