Tickets numbered 1 to 37 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 4 or 10?
Average age of 6 Children’s of a family is 8 years. The average of Children’s and their parent’s age is 22 years. If father is 8 year older than the mother then find the age of their mother.
Let, Mother’s age is = X
Then father’s age = X+8
Sum of age of 6 children’s = 48
Sum of children’s and their parents age = 48+X+X+8= 56+2X
Average of children’s and their parents age = 56+2X /8
As given, 22= 56+2X/8
2X = 120, X= 60 years
A Car covers distance 440 km in 8 hrs. A motorbike covers the same distance in 5 hrs. What is the respective ratio between the speed of the Car and the motorbike?
Distance covered by Car = 440 Km
Time taken to cover 440 km = 08 Hrs.
Speed of Car = 440/8= 55 Km/Hrs.
Speed of motorbike = 440/5 = 88 Km/Hrs.
Hence the required ratio = 55: 88 = 5: 8
From an organization of 6 persons, in how many ways can we choose a manager and a senior manager assuming one person cannot hold more than one position?
The average age of a family of 18 members is 82 years. If the age of the youngest member is 12 years, the average age of the family at the birth of the youngest member was?
Total age of the family of 18 members = 82* 18 = 1476 yrs
Total age of the family members 12 yrs ago = 1476 - (18*12) = 1260
At the time total members in a family = 18
Average age of the family at the birth of the youngest member = 1260/18 = 70yrs.