Question

A certain number between 10 and 100 is 8 times the sum of its digits

Answer 1

Answer:

Step-by-step explanation:

let it be,

(x×10+y)=8(x+y)

10x-8x+y-8y

10x-8x+y+8y=0

2x-7y=0----(1)

10x+y-45=10y+x

10x-x+y-10y=45

9x-9y=45

x-y=5----(2)

2x-7y=0-----(1)

x-y=5-------(2)

2x-7y=0

2x-2y=10

+

---------

-5y=-10

(minus minus cut)

y=10

--. =2

2

x-2=5. (x=7

y=2)

x=7

x×10+y=7×10+2

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