Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of 0.042+0.212-0.00840.043+0.213

If PA and PB are tangents to the circle with centre O such that ∠APB=50°, then the ∠OAB=

P, Q and R are channels which discharge solutions A,B and C respectively in a tank. When the tank is empty and all the three channels are opened what is the proportion of the solution C in the tank after 3 minutes, if the channels P, Q and R can fill the tank from empty to full in 30 minutes and 20 minutes and 10 minutes respectively when they are opened one at a time.

How many natural numbers between 15 and 85 are divisible by 7?

Fraction that lies between 2/5 and 4/9 is

Some masons promised to do a work in 10 days but 8 of them were absent and remaining did the work in 18 days. What was the original number of masons?

The slope of the line passing through the points (7,-2) and (x,1) is -3/10. Find x.

Find the odd letters from the given alternatives.