Question

(b) The digit in the ones place of a 2-digit number is twice the digit at the tens place.
Write the number.​

Answer 1

Step-by-step explanation:

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Let the two digit number is xy

y is digit at unit's place

x is digit at ten's place

⇒ Number can be written as = 10x+y

According to the conditions : y=2x ___ (1)

and

(10x+y)+(10y+x)=99

⇒11x+11y=99

⇒x+y=9 (dividing by 11)

Now x+2x=9 (from (1))

⇒3x=9

⇒x=9/3=3

y=2x=6

⇒ Number is 36

Answer 2

Step-by-step explanation:

let the number is 10*y+x

x=2y given

number become 10*y+2y=y(10+2)

for y=1,2,3.. you get different two digits numbers