herreraj155 herreraj155

03-04-2020
Mathematics

contestada

Add 5 to me.Then divide by 7.If you add 12 and the subtract 7,you get 10

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Officialalehpeter Officialalehpeter

03-04-2020

Answer: 30

Step-by-step explanation:

Let the number be y

Add 5 to me

Y+5............equ1

Divide by 7

Y+5/7

Add 12

Y+5/7+12

Subtract 7

(Y+5)/7+(12-7)=10

12-7=5

Substitute

(Y+5)/7+5=10

Find the lowest common multiple

((Y+5)+7(5))/7=10

(Y+5)+35)/7=10

Cross multiply

Y+5+35=70

Y+40=70

Y=70-40

Y=30

The unknown number is 30

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