1
Question
4A is a two - digit number with 'A' as its units digit and
6 1 A
+1 A 5
______
8 0 3
The sum of the two digit number and 'A' is
4A is a two - digit number with 'A' as its units digit and
6 1 A
+1 A 5
______
8 0 3
The sum of the two digit number and 'A' is
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Solution
The correct option is C 56
Consider unit digits, units digit of (A + 5) = 3 which means there should be a carry over. Here, A is a number between 0 to 9.
We know that 8 + 5 = 13, so A could be equal to 8.
Consider tens digits,
units digit of [1 (carryover) + 1 + A] = 0
If A = 8, then 1(carry over) + 8 + 1 = 10. This 1 is now carried over
Hundreds digits, 6 + 1 + 1(carry over) = 8
6 1 8
+1 8 5
______
8 0 3
Hence, A = 8
The two digit number = 4A = 48
Sum of the number and 'A' = 48 + 8 = 56.
Consider unit digits, units digit of (A + 5) = 3 which means there should be a carry over. Here, A is a number between 0 to 9.
We know that 8 + 5 = 13, so A could be equal to 8.
Consider tens digits,
units digit of [1 (carryover) + 1 + A] = 0
If A = 8, then 1(carry over) + 8 + 1 = 10. This 1 is now carried over
Hundreds digits, 6 + 1 + 1(carry over) = 8
6 1 8
+1 8 5
______
8 0 3
Hence, A = 8
The two digit number = 4A = 48
Sum of the number and 'A' = 48 + 8 = 56.
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