Mathematics Past Questions and Answers

The arithmetic mean of the ages of 30 pupils in a class is 15.3 years. One boy leaves the class and one girl is enrolled, and the new average age of 30 pupils in the class becomes 15.2 years. How much older is the boy than the girl?

A 30 years
B 6 years
C 9 years
D 3 years
E 1 year

Question 712:

In the diagram, angle QPR = 90^o, angle PSR = 90^o and PR = 5 units. Find the length of QS.

A 5 tan 25^o sin 65^o
B 5 cos 25^o sin 65^o
C 5 tan 25^o cos 65^o
D Cos 25^o cos 65^o
E 5 cosec 25^o

Question 713:

The diagram is the distance time graph of a vehicle. Find its average speed in kilometers per hour during the journey

A 155km/hr
B 50km/hr
C 40km/hr
D 124km/hr
E 84km/hr

Question 714:

In the fiqure where PQRTU is a circle, ISTI = IRSI and angle TSR = 52^o. Find the angle marked m

A 128^o
B 52^o
C 104^o
D 64^o
E 116^o

Question 715:

If K is a constant, which of the following equations best describes the parabola?

A Y = kx²
B X = y² - k
C Y = k - x²
D X² = y² - k
E Y = (k - x)²