If the nine-digit number 708x6y8z9 is divisible by 99, then what is the value of x + y + z ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 16
| Understanding | Application |
| We will test the divisibility of 9 in the given number. |
As 9 is a factor of 99 so we will test the divisibility of 9 in the given number. Digital sum = 7 + 0 + 8 + x + 6 + y + 8 + z + 9 = 38 + x + y + z The sum should be divisible by 9, for this ⇒ x + y + z + 38 = 45 / 54 / 63 ⇒ x + y + z = 7 / 16 / 25 The only available option is 16 i.e. our answer. |