Quantitative Aptitude - Arithmetic Ability Questions

The average of first 20 multiples of 12 is

(45.004% of 1439.97 –15.99% of 2249.97) ÷ 35.98 = ?

In a class of 50 students there are 27 boys. The average weight of these boys is 72 Kg and average weight of the full class is 55.44 kgs. What is the average weight (in kgs) of the girls of the class?

tan3A is equal to

Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.

The areas of two similar triangles ΔABC and ΔPQR are 36 sq cms and 9 sq cms respectively. If PQ = 4 cm then what is the length of AB (in cm)?

D and E are points on side AB and AC of ΔABC. DE is parallel to BC. If AD:DB = 1:4 and area of ΔADE is 6 sq cm, what is the ratio of area of ΔADE: area of quadrilateral BDEC?

What is the fourth proportional to 6, 24 and 83?