78. In a division sum, the remainder is 0. A student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient ?

A.0

B.12

C.13

D.20

79. The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers ?

A.12/35

B.1/35

C.35/8

D.7/32

80. If 60 % of 3/5 of a number is 36, then the number is :

A.80

B.100

C.75

D.90

81. The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is :

A.3/5

B.3/10

C.4/5

D.5/4

82. On dividing 2272 as well as 875 by 3-digit number N, we get the same remainder. The sum of the digit of N is :

A.10

B.11

C.12

D.13

83. On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is :

A.47619

B.47719

C.48619

D.47649

84. The difference of the squares of two consecutive even integers is divisible by which of the following integers ?

A.3

B.4

C.6

D.7

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