6, 9, 15, 21, 24, 28, 30
Question:
6, 9, 15, 21, 24, 28, 30
[A].
28
21
24
30
6, 9, 15, 21, 24, 28, 30
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
Each of the numbers except 28, is a multiple of 3.
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Which of the following numbers will completely divide (4915 – 1) ?
Question: Which of the following numbers will completely divide (4915 – 1) ?
[A].8 [B].
14 [C].
46 [D].
50 Answer: Option A
Explanation:
(xn – 1) will be divisibly by (x + 1) only when n is even.
(4915 – 1) = {(72)15 – 1} = (730 – 1), which is divisible by (7 +1), i.e., 8.
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
Question:
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
[A].84 [B].
90 [C].
168 [D].
336 Answer: Option A
Explanation:
Let the length of the wire be h.
Radius = 1 mm = 1 cm. Then, 2 20 22 x 1 x 1 x h = 66. 7 20 20 h = 66 x 20 x 20 x 7 = 8400 cm = 84 m. 22 A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
Question:
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
[A].18 [B].
24 [C].
42 [D].
81 Answer: Option B
Explanation:
Let the ten’s and unit digit be x and 8 respectively. x Then, 10x + 8 + 18 = 10 x 8 + x x x 10×2 + 8 + 18x = 80 + x2
9×2 + 18x – 72 = 0
x2 + 2x – 8 = 0
(x + 4)(x – 2) = 0
x = 2.
40960, 10240, 2560, 640, 200, 40, 10
Question:
40960, 10240, 2560, 640, 200, 40, 10
[A].640 [B].
40 [C].
200 [D].
2560 Answer: Option C
Explanation:
Go on dividing by 4 to get the next number.
So, 200 is wrong.
What will be ratio of simple to compound interest on two same sums invested in SBP at rate of interest of 8% kept for 3 years?
What will be ratio of simple to compound interest on two same sums invested in SBP at rate of interest of 8% kept for 3 years?A. 1875/2029
B. 1/2.5
C. 1903/2156
D. 4/9A sum of money placed at C.I. interest doubles itself in 5 years. It will amount to eight times itself at the same rate of interest in?
A sum of money placed at C.I. interest doubles itself in 5 years. It will amount to eight times itself at the same rate of interest in?A. 7 years
B. 10 years
C. 15 years
D. 20 years
Explanation:
P(1 + R/100)5 = 2P => (1 + R/100)5 = 2
Let P(1 + R/100)n = 8P
=> (1 + R/100)n = 8 = 23 = {(1 + R/100)5}3
=> (1 + R/100)n = (1 + R/100)15 => n = 15 Required time = 15 years.