Number System
In how many ways can 5 boys be chosen from 6 boys and 4 girls so as to include exactly one girl ?

60
54
56
58

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Number System
The sum of five consecutive odd numbers of set p is 435. What is the sum of five consecutive numbers of another set q. Whose largest number is 45 more than the largest number of set p?

730
770
670
530

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Number System
The peresent age of the father and the son are in the ratio of 8:3. After 12 years the ratio of their ages will be 2:1. What is the sum of the present age of the father and the son ?

67 years
68 years
69 years
66 years

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