Quantitative Aptitude - Arithmetic Ability Questions

Find length of the arc whose central angle is 45° and radius of the circle is 28 cm?

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

A and B together do a job in 15 days and A alone could do the same job in 20 days. How many days would B take to do half the job if he worked alone?

24 men can do a piece of work in 17 days.How many men will be able to do it in 51 days ?

If (1 - cosA)/2 = x, then the value of x is

A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed . If the average speed is 6.4 km/hr in total , then the return speed (in km/hr) is

A can complete a work in 20 days and B can complete the same work in 25 days. If both of them work together, then in 3 days what percent of the total work will be completed?

The ratio 1 : 5 can be expressed in decimal as