Quantitative Aptitude - Arithmetic Ability Questions

Let A(O,-1), B(0,3) and C(2,1) be three points. Let   △1 be the area of the triangle ABC and △2 be the area of the triangle formed by the mid points of the sides of the triangle whose vertices are A, B and C such that △1=1 ,△2=x Find the value of x .

In which of the following quadrilaterals both pairs of opposite sides are parallel?

At 20% discount the selling price of an article is Rs 2400, what is the selling price (in Rs) if the discount is 32.5%?

A bag has Rs 43 in the form of 5-rupee, 50-paise and 10-paise coins in the ratio of 1:5:11. What is the total number of 50-paise coins?

If x + (1/x) = 2, then what is the value of x21 + (1/x1331)?

When a number is increased by 24, it becomes 110% of itself. What is the number?

Two numbers are in the ratio of 15 : 11. If their HCF is 13, then the greater number is?

A spherical lead ball of radius 6 cm is melted and small lead balls of radius 3 mm are made. The total number of possible small lead balls is