rarediamond87628
Answered

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Help me ASAP PLEASE

I thought of a number, divided 80 by my number, added 13, and then I multiplied the result by 5. I got 75. What is my number?

Sagot :

hhelsinki

Answer:

Your(my) number is 40

Step-by-step explanation:

I. Given 80/something, + 13, * 5 = 75 when x is something

So [  [tex]\frac{80}{x}[/tex] + 13 ]5 = 75

     [ [tex]\frac{400}{x}[/tex] + 65] = 75

     [tex]\frac{400}{x}[/tex] = 75 - 65

     [tex]\frac{400}{x}[/tex]  = 10

     400 = 10x

        x = 40

II. Prove by replace 40 in x

    [(80/40) + 13]5 = 75

    [2 + 13] 5 = 75

    (15)5 = 75

        75 = 75 true

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