Quantitative Aptitude - Arithmetic Ability Questions

In Δ ABC , if ∠BAC = 90° and AB = AC , then ∠ABC is

In an isosceles triangle ABC, AB = AC, XY || BC. If ∡A = 30, then ∡BXY =

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

Among three numbers , second is twice the first and also thrice the third . If the average of the three numbers is 33 , then the largest number is

Which of the following is the largest number among 2, 33, 4, 53

If a cone is divided into two parts by drawing a plane through the midpoints of its axis, then the ratio of the volume of the 2 parts of the cone is

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

D and E are points on side AB and AC of ΔABC. DE is parallel to BC. If AD:DB = 2:5 and area of ΔABC is 98 cm sq, what is the area (in sq cm) of quadrilateral BDEC?