The number N is 6,2X4, where X represents the ten's digit. If N is divisible by 9, what is the value of X?
Options:
(A) 1
(B) 3
(C) 5
(D) 7
(E) 6
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Integer is divisible by 9 - Sum of digits is divisible by 9 So the answer is: (E).
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Find the product of the localvalue and absolutevalue of 5 in 20568?
Options:
(A) 1000
(B) 2500
(C) 1200
(D) 5000
(E) 1600
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Local value of 5 = 5 x 100 = 500
Place value of 5 = 5
There fore = 5 x 500 = 2500 So the answer is: (B).
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At 15:00 there were 21 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 8 students left the lab, how many students were in the computer lab at 15:44 ?
Options:
(A) 7
(B) 14
(C) 25
(D) 27
(E) 30
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Initial no of students + 3 * (1 + No of possible 3 minute intervals between 15:03 and 15:44) -
8 *(1 + No of possible 10 minute intervals between 15:10 and 15:44)
20 + 3*14 -8 * 4 = 27 So the answer is: (D).
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