Question

Sum of the digits of a two digit number is 12. If the digit at unit's place is 3 less than two times of the digit at the ten’s place. Find the number?​

Answer 1

Answer:

therefore the number is 57.

Step-by-step explanation:

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Answer 2

The number is 57

Given - Sum and relation between the digits

Find - Number

Solution - Let the number at one's place be x and number at ten's place be y. The number will be - 10y + x.

Now, forming the first equation -

10y + x = 12

Forming second equation -

x = 2 × 10y - 3

x = 20y - 3

Keeping the value of x form second equation in first equation

New equation will be -

10y + 20y - 3 = 12

30y = 12 + 3

30y = 15

y = $\frac{15}{30}$

y = 0.5

Finding x by keeping the value of y in second equation

x = 20 × 0.5 - 3

x = 10 - 3

x = 7

So, the number will be = 10 × 0.5 at ten's place and 7 at unit's place

Number = 5 at ten's place and 7 at unit's place

Number = 57

Hence, the number is 57.

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