A number consists of two digits whose sum is 7 If the digits are reversed the number is increased by...........

Quantitative Aptitude (CDS) Number System

A number consists of two digits, whose sum is 7. If the digits are reversed, the number is increased by 27. The product of digits of the number is

छोटे Courses बड़े Results

Master Number System

Prepare through Micro-courses

Try Now

Explanation:

Let the digit at the tens place and units place be x and y, respectively.
∴x+y=7.....(1)
Also 10y+x=10x+y+27
⇒−9x+9y=27
⇒−x+y=3....(2)
Adding (1) and (2), we get
2y=10⇒y=5
∴x=7−5=2
Product of the digits of the number =xy=2×5=10