Question

Sum of the digits of a two-digit

number is 12. a) If the digits are

same, write the number. b) If the

digit at unit's place is 3 less than 2 times of the digit at the ten's

place, find the number​

Answer 1

Answer:

a) 66

b) 39

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Answer 2

Answer:

a) 66

b) 57

Step-by-step explanation:

a) let the digit at unit place = x

digit at unit place = digit at tens place

we know,

sum of the digits = 12

therefore, x + x = 12

2x = 12

x = 12/2

x= 6

therefore the no. formed is 66.

b) let the digit at tens place = x

digit at unit place = 2x -3 ( as it is said in the question 3 less than 2 times of the digit at the tens)

thus, 2x - 3 + x = 12

2x + x = 12 + 3

3x = 15

x = 15/3

x = 5

the no. at tens place = 5

no. at unit place = 2 × 5 - 3

= 7

therefore, no. formed is 57.