Question

"Question 1 Find the values of the letters in the following and give reasons for the steps involved.

3 A
+ 2 5
__________
B 2
__________

Class 8 Playing with Numbers Page 255"

Answer 1

Numbers can be written in general form. Hence, a two digit number ab will be written as ab = 10a + b.

The general form of numbers is helpful in solving puzzles or number games.

Rules to be followed while solving the puzzles:. Each letter in the puzzle must stand for just one digit. Each digit must be represented by just one letter. 2. The first digit of a number cannot be zero.

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Solution

 Put A = 1, 2, 3, 4, 5, 6, 7 and so on and we get, 7 + 5 = 12 in which ones place is 2.

A = 7

And put 2 and carry over 1, we get

B = 6

Hence, A = 7 & B = 6

   3 A
+ 2 5
__________
   B 2 
__________



   3 7
+ 2 5
__________
   6 2 

__________

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Hope this will help you..