Quantitative Aptitude - Arithmetic Ability Questions

Two numbers are in the ratio 2:5 and their HCF is 18. Their LCM is

By what fraction selling price (S.P.) must be multiplied to get the cost price (C.P.) if the loss is 20% ?

A fan was sold for Rs. 3600 at a loss of 4%. What would be the gain or loss percent ifit was sold for Rs. 4200?

P bought an article for Rs. 1600 and sold it at a profit of 10%. What would have been the increase in the profit percent if it was sold for Rs. 1840?

20 boys do one fourth of work in 25 days. How many more boys will be required to complete the remaining work in 50 days?

If x1/4 + x-1/4 = 2, then what is the value of x81 + (1/x81)?

If secθ = cosecq with 0° < θ , q < 90°, then the value of sin (θ + q) is

Determine the value of z in the equation: z = 20+20+20+20+...∞