Just for fun!

Algebra Level 1

  • Pick any number and multiply it by 2.

  • Add 21

  • Then subtract by the doubled original number.

  • Then multiply by 2018.

  • Finally, divide by 1009

What is your result?


The answer is 42.

Munem Shahriar by Munem Shahriar , 18, Bangladesh

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3 solutions

Munem Shahriar
Jan 13, 2018

Suppose the number is x x . The expression becomes:

2 x + 21 × 2018 − 2 x 1009 \dfrac{2x + 21 \times 2018 - 2x}{1009}

= 21 × 2 × 1009 1009 = \dfrac{21 \times 2 \times 1009}{1009}

= 21 × 2 = 21 \times 2

= 42 = \boxed{42}

2 Helpful 0 Interesting 0 Brilliant 0 Confused

At the step 21 × 2018 1009 \dfrac{21 \times 2018}{1009} you could just simplify 2018 2018 as 2 × 1009 2 \times 1009 , avoiding multiplying out 21 by 2018.

21 × 2 × 1009 1009 21 × 2 = 42 \dfrac{21 \times 2 \times \cancel{1009}}{\cancel{1009}} \\ 21 \times 2 = \boxed{42}

A Former Brilliant Member - 3 years, 4 months ago

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You are correct. I have updated my solution. Thanks :)

Munem Shahriar - 3 years, 4 months ago

Simplificas ´´x´´ número en una ecuación y queda el mismo resultado para todo.

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Aaghaz Mahajan
Jan 13, 2018

The answer to the ultimate question of life, the universe and everything....

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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