81. A rational number between $${\text{ }}\frac{3}{4}$$ and $${\text{ }}\frac{3}{8}$$ is :
82. If the operation '*' is defined by a * b = a + b - ab, then 5 * 7 equals :
83. The smallest five digit number which is divisible by 12, 18 and 21 is :
84. $$1 + \frac{1}{2} + \frac{1}{4} + \frac{1}{7} + \frac{1}{{14}} + \frac{1}{{28}}$$ is equal to :
85. In a two digit number, the digit at the unit's place is 1 less than twice the digit at the ten's place. If the digits at unit's and ten's place are interchanged, the difference between the new and the original number is less than the original number by 20. The original number is :
86. Find the sum of all positive multiples of 3 less than 50 :
87. The value of $$\left( {0.\overline {63} + 0.\overline {37} } \right)$$ is :
88. If 1 is added to the both the numerator and the denominator of a fraction, it becomes $$\frac{1}{4}$$ . If 2 is added to both the numerator and the denominator of that fraction it becomes $$\frac{1}{3}$$ . The sum of the numerator and the denominator and the denominator of the fraction is -
89. A man ate 100 grapes in 5 days. Each day he ate 6 more grapes then those he ate on the earlier day. How many grapes did he eat on the first day ?
90. The least number of five digits which is divisible by 123 ?
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