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Let n be the number of people present. For every handshake, 2 persons are required. Since each handshake is between two persons, the total number of handshakes = nC2 =28 n! /{(n-2)! * 2!} = 28 n(n-1) = 56 So, n =8
A boy’s age is 140% of what it was 5 years ago, but 65% of what it will be after 10 years. What is his present age?
Present ages of ‘A’, ‘B’ and ‘C’ are in the ratio 10:12:15, respectively. If present average age of ‘A’ and ‘C’ is 50 years, then fi...
Average of present age of A and C is 29 years and C is 8 years younger than B. Ratio of present age of A to present age of B is 6:5. Find present age of B.
In a classroom there are 12 boys and 10 girls. Average age of each boy and each girl is 22 years and 18 years respectively. The sum of ages of all the b...
The respective ratio of the present ages of A and B is 5:6. The present age of C is 20% more than that of B. The sum of the present ages of A, B and C i...
A is younger than B by 4 years. If the ratio of A and B ages is 5:7 respectively, then find the age of A.
B is 4 years older than A and A is 8 years older than C. If the sum of the age of A and C is 22 years, then find the sum of the ages of all three.
The age of person A (y + 3) years ago and the age of person B (y + 4) years from now are in the ratio 2:3.
Additionally, it is given that:A is 5 ...
At present, the age of the father is 5 times that of the age of his son. After 10 years, the father’s age would be 3 times that of his son. Find t...
The average age of a group of 70 students is 14 years. If three students whose ages are 22 years, 20years, ________ years are replaced with th...
