TCS Company Logical Reasoning Blood Relations

The sum of two times one natural number and three times another natural number is less than 24. if the first natural number is less than or equal to eight,the highest value of the second natural number is:
(A)5 (B)6 (C)7 (D)8 (E)9

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TCS Other Question

Variable R and S are related by the equation R=1/S2(1 by S square).now,if S is increased by 10%,what will happen to R?
(A)R decreased by 19% (B)R decreased by 10% (C)R decreased by 17% (D)R decreased by 21% (E)R increased by 21%
A class photograph has to be taken.the first row consists of 6 girls who are sitting.20 boys are standing behind.The two comer position are reserved for the two tallest boy.In how many ways can the students be arranged?
(A)18!*720 (B)6!*1440 (C)18!*2!*1440 (D)18!*1440 (E)none of these