Quantitative Aptitude - Arithmetic Ability Questions

If a = √2 + 1, b = √2 - 1 then the value of 1a+1+1b+1 ?

Mansukh can do a piece of work in 10 hours. If he is joined by Jayanti who is 50% more efficient, in what time will they together finish the work?

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

If N = 0.369369369369... and M = 0.531531531531..., then what is the value of (1/N) + (1/M)?

Ravi invested Rs.P in a scheme A offering simple interest at 10% p.a. for two years. He invested the whole amount he received from scheme A, in another scheme (B) offering simple interest at 12% p.a. for five years. If the difference between the interests earned from schemes A and B was Rs. 13,00/, what is the value of P ?

56/32 simplified value?

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?