Question

Tens digit of a two digit number is twice its units digit if the sum of the digits is 12 find the number

Answer 1

Answer:

LET UNIT DIGIT BE X

LET UNIT DIGIT BE XTENS DIGIT = 2X

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 12

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12X = 12/3

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12X = 12/3X = 4

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12X = 12/3X = 4UNIT DIGIT = 4

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12X = 12/3X = 4UNIT DIGIT = 4TENS DIGIT = 2 × 4 = 8

LET UNIT DIGIT BE XTENS DIGIT = 2XA.T.Q 2X + X = 123X = 12X = 12/3X = 4UNIT DIGIT = 4TENS DIGIT = 2 × 4 = 8NUMBER = 84

HOPE IT HELPS.....

Answer 2

Answer:

Step-by-step explanation:

Tens digit =x

Units digit =(12-x)(sum of digits =12)

x=2(12-x)

x=24-2x

3x=24

x=8

Therfore number=8*10+(12-8)

=84