Question

2.A two-digit number is three
times the sum of its digits.
Then the number is:
O
40
O 27
O 73
O 50​

Answer 1

If we write the number as xy and assume base 10, then we know that:

10x+y = 3 (x + y). Where x and y are single-digit numbers.

If we simplify that, we get:

10x + y = 3x + 3y

7x = 2y

Because 2y will always be an even number, then x has to be even as well. For a 2 digit number, x can’t be zero. This means x can only be 2, 4, 6, or 8. With only 4 possible values, we can simply try them:

x-y

2-7

4–14

6–21

8–28

Only the first pair (2–7) has single digit numbers for x and y so it is the only valid solution(*) and your number is 27.

(*) 0–0 also works but we don’t normally write numbers that way.

Please Mark me as brainliest

Answer 2

Given :

• A two-digit number is three times the sum of its digits.

To find :

• Then the number is

Solution :

$\: \: \: \: \: \: \: \: \: \: \: T \: \: \: O \\ 10 \times \boxed{} \: \: \boxed{} \\ \\ \sf{By \: hit \: and \: trial \: method \: we \: get }\\ \\ \implies \sf{10 \times \boxed{2} + \boxed{7} }\\ \\ \implies \sf{20 + 7} \\ \\ \implies \sf{27} \\ \\ \sf{Sum \: of \: digits} \\ \\ \sf\implies{ 2 + 7} \\ \\ \implies \sf{9} \\ \\ \sf{Three \: time \: sum \: of \: digits} \\ \\ \implies \sf{3 \times 9} \\ \\ \implies \sf{27}$

∴ Option 2 (27) is correct

Extra information :

• Volume of cylinder = πr²h
• T.S.A of cylinder = 2πrh + 2πr²
• Volume of cone = ⅓ πr²h
• C.S.A of cone = πrl
• T.S.A of cone = πrl + πr²
• Volume of cuboid = l × b × h
• C.S.A of cuboid = 2(l + b)h
• T.S.A of cuboid = 2(lb + bh + lh)