Tick (✓) the correct answer

Question:

Tick (✓) the correct answer

If 7x8 is exactly divisible by 9, then the least value of x is

(a) 0

(b) 2

(c) 3
(d) 5

Solution:

(c) 3

If a number is exactly divisible by 9, the sum of the digits must also be divisible by 9.

$7+x+8=15+x$

18 is divisible by 9 .

$\therefore 15+x=18 \Rightarrow x=3$

 

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