Advertisements
Advertisements
प्रश्न
In a two-digit number, digit in units place is twice the digit in tens place. If 27 is added to it, digits are reversed. Find the number.
Advertisements
उत्तर
Let ten’s digit of two-digit number be x.
Then unit’s digit = 2x
∴ Number = 10 × x + 2x
= 10x + 2x
= 12x
On reversing the digits,
New number = 10 × (2x) + x
= 20x + x
= 21x
12x + 27 = 21x
⇒ 21x – 12x = 27
⇒ 9x = 27
⇒ x = 3
Hence, the required number is 12 × 3, i.e. 36.
APPEARS IN
संबंधित प्रश्न
A positive number is 5 times another number. If 21 is added to both the numbers, then one of the new numbers becomes twice the other new number. What are the numbers?
Sum of the digits of a two digit number is 9. When we interchange the digits it is found that the resulting new number is greater than the original number by 27. What is the two-digit number?
Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of this mother’s present age. What are their present ages?
Half of a herd of deer are grazing in the field and three fourths of the remaining are playing nearby. The rest 9 are drinking water from the pond. Find the number of deer in the herd.
A grandfather is ten times older than his granddaughter. He is also 54 years older than her. Find their present ages
Arjun is twice as old as Shriya. Five years ago his age was three times Shriya’s age. Find their present ages.
The digit in the tens place of a two-digit number is 3 more than the digit in the units place. Let the digit at units place be b. Then the number is ______.
A and B are together 90 years old. Five years ago A was thrice as old as B was. Hence, the ages of A and B five years back would be (x – 5) years and (85 – x) years respectively.
After 12 years, Kanwar shall be 3 times as old as he was 4 years ago. Find his present age.
