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Six X's have to be placed in the squares of the figure given below such that each horizontal row contains at least one X. How many maximum different ways can this be done?
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Important Questions on General Mental Ability (Quantitative Aptitude /Reasoning)

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The average score of three boys in Mathematics is 30. When the score of a fourth boy is added to the total score of the three boys, the average is lowered to 25. What is the score of the fourth boy?

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The sum of income of A and B is more than that of C and D taken together. The sum of income of A and C is the same as that of B and D taken together. Moreover, A earns half as much as the sum of the income of B and D. The highest income is of
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In class of 60 students, where the girls are twice that of boys, Kamal ranked seventeenth from the top. If there are 9 girls ahead of Kamal, the number of boys in rank after him is:
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The number of terms between 11 and 200 which are divisible by 7 but not by 3 are
EASY
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What is the 6th term in the sequence of 2,3,6,11,18?
EASY
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Let a number of three digits have for its middle digit the sum of the other two digits. Then it is a multiple of
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A set of figures carrying certain number is given. Assuming that the numbers in each figure follow a similar pattern, the missing number is

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 'A' completes a work in 10 days, while 'B' and 'C' complete it in 12 and 15 days respectively. In how many days can 'A', 'B' and 'C' together complete the work?