Quantitative Aptitude - Arithmetic Ability Questions

If x2-2x+1=0,then the value of x4+1x4 is

In a class, 60% of children like Mathematics, 45% like Science and 25% like both Mathematics and Science. What is the percentage of children who like at least one subject?

sec2Acosec2A is equal to

The third proportional of two numbers 4 and 20 is

Gautam goes to office at a speed of 12 kmph and returns home at 10 kmph.His average speed is

The ratio of speeds of X and Y is 5:7. Y covers a distance of 420 km in 3 hours. What is the speed of X?

At 10% discount the selling price of a toaster is Rs 18000, what is the selling price if the discount is 37.5%?

If x + y = 10 and xy = 4, then what is the value of x4 + y4?