If a nine-digit number 785x3678y is divisible by 72, then the value of (7x-5y) is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 22
Divisibility by 8 , last 3 digits = 8y8
y = 4 ⇒ 848 ÷ 8 = 106
Divisibility by 9 , sum = 48 + x
x = 6 ⇒ 48 + 6 = 54
Now:
7x − 5y = 7(6) − 5(4) = 42 − 20 = 22