Question
If the 9-digit number 5y97405x2, is divisible by 72,
find the value of (x – 2y) for the greatest value of x.Solution
For the number 5y97405x2 to be divisible by 72: Divisibility by 8: Last three digits (5x2) must be divisible by 8. For x = 4, (542) is divisible by 8. Divisibility by 9: Sum of digits (36 + y) must be divisible by 9. For (y = 0), (36) is divisible by 9. Thus, with (x = 4) and (y = 0), (x - 2y = 4 - 2(0) = 4.
More Divisibility rules Questions
√3598 × √(230 ) ÷ √102= ?
15% of 2400 + (√ 484 – √ 256) = ?
(13)2 - 3127 ÷ 59 = ? x 4
6269 + 0.25 × 444 + 0.8 × 200 = ? × 15
...(53 + 480 ÷ 4)% of 20 = ?% of 70
Find the simplified value of the following expression:
62 + 122 × 5 - {272 + 162 - 422}
(15 × 225) ÷ (45 × 5) + 480 = ? + 25% of 1240
√ [? x 11 + (√ 1296)] = 16
11 × 25 + 12 × 15 + 14 × 20 + 15 = ?
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