What is the are of an equilateral triangle of side 16 cm?
A. 48√3 cm2
B. 128√3 cm2
C. 9.6√3 cm2
D. 64√3 cm2
Basic Arithmetic
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is__________?
A. 53.33
B. 54.68
C. 55
D. None of these
If the sides of a triangle are 26 cm, 24 cm and 10 cm, what is its area?
A. 120 cm2
B. 130 cm2
C. 312 cm2
D. 315 cm2
The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________?
A. 123
B. 137
C. 121
D. 122
The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
A. 47.55 kg
B. 48 kg
C. 48.55 kg
D. 49.25 kg
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________?
A. 17 kg
B. 20 kg
C. 26 kg
D. 31 kg
The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ration of the number of boys to the number of girls in the class is___________?
A. 1:2
B. 2:3
C. 3:4
D. 3:5
The average of women and child workers in a factory was 15%yr. The average age of all the 16 children was 8yr and average age of women workers was 22 yrs if ten women workers were married then the number of unmarried women workers were________?
A. 16
B. 12
C. 8
D. 6
The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.
A. 57.4
B. 57.5
C. 58.9
D. 59.1
A person travels from x to y at a speed of 40Km/h and returns by increasing his speed 50%. What is his average speed for both the trips?
A. 36km/h
B. 45km/h
C. 48km/h
D. 50km/h