Quantitative Aptitude - Arithmetic Ability Questions

Find the circumference (in cm) of a circle of radius 10.5 cm

X is 25% more efficient than Y. If Y alone can make a chair in 10 days, then X alone can make the chair in how many days?

In a class of 55 students there are 34 girls. The average weight of these girls is 51 Kg and average weight of the full class is 55.2 kgs. What is the average weight of the boys of the class?

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?

If x + y = 12 and x2 + y2 = 94, then xy is 

A's income is 25% more than B's income. B's income is what percent of A's income?

Simplify : 132 - 142 + 172 - 250 = ?

Which of the following will yield a reclining decimal?