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What Names The Animal ? Answer Please? - Duration: 2:33.
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CAN YOU SOLVE THE MATH PROBLEM? (answer explained) - Duration: 3:10.
Hi guys, I wrote a whole number on the piece of paper
After that I subtract 20 from the number then multiply it by 20
Add 18 and
Finally divide by 18 as a result. I got the initial number. What is the number?
Pause the video if you want to figure it out for yourself and then keep on watching for solution
Mark initial number as X
top-right number as X1
bottom right number as X2 and bottom left number as X3
X1 equals to 2X minus 20
X2 equals to 2X minus 20 multiply by 20
after removing the parentheses we get
20X minus
400
X3 equals to
20X minus 400 plus 18 and it equals to 20X minus 382
And
Finally when we divide 20X minus
382 by 18 we obtain the initial number X so we have an equation
To simplify it. Let's multiply both sides by 18
On the right side of the equation we can simplify the fraction
After this, we get 20X minus 382 on the right side.
Group X numbers on the left side
We get minus 2X equals to minus
382
Divide both sides by -2
So X equals to 191 and that's the correct answer to the problem
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