Quantitative Aptitude - Arithmetic Ability Questions

If 2x-12x = 5, then what is the value x2 + 116x2 - 2

If x = (√5) + 1 and y = (√5) – 1, then what is the value of (x2/y2) + (y2/x2) + 4[(x/y) + (y/x)] + 6?

A discount series of 15%, 20% and 25% is equal to the single discount of?

In what ratio tea at Rs 240/kg should be mixed with tea at Rs 280/kg so that on selling the mixture at Rs 324/kg there is a profit of 20%?

A wholesaler sells a watch to a retailer at a gain of 20% and the retailer sells it to a customer at a loss of 10%. If the customer pays Rs 874.8, what had it cost the wholesaler?

In a triangle PQR, S and T are the points on PQ and PR respectively, such that ST II QR and PS/SQ=3/5,PR =6cm, then PT is

If sin - 4π/3 = x, then the value of x is

25% discount is offered on an item. By applying a promo code a customer wins 10% cash back. What is the effective discount?