Question
Find the greatest value of (a + b) such that an 8-digit
number 4523a60b is divisible by 15.Solution
Factors of 15 = (3 × 5) and the divisibility rule of 15 says that sum of digits be divided by 3 and the last number will be 5. Possible values of b are 0 and 5 Now, 4 + 5 + 2 + 3 + a + 6 + 0 + 0 = 20 + a Here a can be 1, 4, 7 For greatest we need to take 7 So, a + b = 7 + 0 = 7 which is not present in the option Again, 4 + 5 + 2 + 3 + a + 6 + 0 + 5 = 25 + a Here a can be 2, 5, 8 For greatest we need to take 8 So, a + b = 8 + 5 = 13 which is present in the option ∴ Required answer is 13
15(2/9) + 11(2/9) + 17(1/9) + 13(4/9) = ?
(6.013 – 20.04) = ? + 9.98% of 5399.98
3(2/5) + 6(1/3) + 3(2/5) + 11(2/3) =?
`sqrt(7744)` - `sqrt(4761)` + `sqrt(8281)` + `sqrt(5625)` + ? = 1856
17% of 250 + ? = 108
(〖(0.4)〗^(1/3) × 〖(1/64)〗^(1/4) × 〖16〗^(1/6) × 〖(0.256)〗^(2/3))/(〖(0.16)〗^(2/3) × 4^(-1/2) ×〖1024〗^(-1/4) ) = ?
What will come in the place of question mark (?) in the given expression?
? X 7 + (243)⁽²/⁵⁾ = 380 ÷ 2 + 71Find the value of x.
√441 ÷ 21+ √400 = 1 × x
1240 ÷ ? = 242 + 123 – 514 × 4
Simplify: 60 ÷ 5 × 3 + 8 × (7 − 4)
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