Q. 155.0( 1 Vote )

If 5 A × A = 399,

Answer :

According to the question

A x A = 9

⇒ The one’s place in the product of A and A is 9

∴ A is the number whose multiplication with itself gives a two digit number having 9 in it’s one’s place.

Hence A = 7 because A x A = 49 and one’s place of 49 is 9

∴ Option (c) is correct.

Rate this question :

How useful is this solution?

We strive to provide quality solutions. Please rate us to serve you better.

Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts

Dedicated counsellor for each student

24X7 Doubt Resolution

Daily Report Card

Detailed Performance Evaluation