Question:
Mark (✓) against the correct answer
If x48y is exactly divisible by 9, then the least value of (x + y) is
(a) 4
(b) 0
(c) 6
(d) 7
Solution:
(c) 6
When a number is divisible by 9, the sum of its digits is also divisible by 9.
$x+4+8+y=12+(x+y)$
For $12+(x+y)$ to be divisible by 9 :
$12+(x+y)=18 \Rightarrow(x+y)=6$
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