85. The difference of the squares of two consecutive odd integers is divisible by which of the following integers ?
A.3
B.6
C.7
D.8

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86. n is a whole number which when divided by 4 gives 3 as remainder. What will be the remainder when 2n is divided by 4 ?
A.3
B.2
C.1
D.0

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87. A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) =?
A.10
B.11
C.12
D.15

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88. If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11 ?
A.4x + 6y
B.x + y + 4
C.9x + 4y
D.4x - 9y

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89. If the number 653 xy is divisible by 90, then (x + y) =?
A.2
B.3
C.4
D.6

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90. Which of the following numbers is divisible by each one of 3, 7, 9 and 11 ?
A.639
B.2079
C.3791
D.37911

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91. A number when divided by 6 leaves a remainder 3. When the square of the number is divided by 6, the remainder is:
A.0
B.1
C.2
D.3

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