CTS Company Numerical Ability LCM and HCF

Out of 50 men in a town, 30 are Lions club members, 10 are Lions members as well as Rotary club members. There are 3 who do not belong either. Then how many Rotary club members are there?
(a) 15 (b) 18 (c) 20 (d) 25

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CTS Other Question
There r five boxes. In the first box we put some chocolates. Each box the number of choc is reduced by 1/4. The last box contains 4.Then the number of choc in the first box is Total of 100 people work in an organization. Of which 63 work in office, 57 work in factory and there are none who work outside. Then how many of them work in both?
(a) 10 (b) 25 (c) 18 (d) 20