Question

Andu thinks of a number he divides it by 4 then subtracts 8 the answer is 5 what number did he thinks of​

Answer 1

Answer:

$\huge \underline \mathbb {SOLUTION:-}$

Luigi from Humanitree and Karrthic from Australian International School Malaysia found an algebraic expression for the final number. This is Karrthic's work:

The operation is

(x+4)×2−7=y

For example

(5+4)=99×2=1818−7=11

When you reverse the operation, you find x

Furkan from TED Ankara Koleji in Turkey, Bernd and Qianwei from Humanitree and Shriya from International School Frankfurt in Germany showed what the computer does algebraically. This is Qianwei's work:

(x+4)×2−7=y

If we want to get x, we need to do the opposite of this equation.

Start with y. In the equation 7 [was subtracted], so we need to add 7 to y

(7+y)

In the equation, (x+4) was doubled, we need to divide it by two to get the opposite.

(7+y)÷2

In the equation, x was added [to] 4, to get the opposite, we need to take away 4 from x.

(y+7)÷2−4

Finally the equation we used to find x will be:

(y+7)÷2−4=x

☺︎︎HopeItHelps☺︎︎

Answer 2

Answer:

let the no. be x

ATQ,

x/4 - 8 = 5

x/4 = 5 + 8

x = 13/4 or $3 \frac{4}{12}$

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