Question 10 Find the values of the letters in each of the following and give reasons for the steps involved.
Here, A + B ends with 9
A can be 0, 1, 2, 3,………..8, 9
B can be 0, 1, 2, 3…………8, 9
If we take maximum values of A and B,
i.e. For A = 9 , B = 9
A + B = 9 + 9 = 18
∴ A + B ≠ 19
So, A + B must be 9
∴ A + B = 9
Hence,
2 + A will ends with 0.
We put different values of A,
and check which ends with 0
∴ A = 8
Putting A = 8
Here,
∴ B = 1
Checking
Putting A = 8, B = 1
Hence verified
∴ A = 8 and B = 1

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo

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