Quantitative Aptitude - Arithmetic Ability Questions

What are the co­ordinates of the centroid of a triangle, whose vertices are A(­2,­5), B(4,­4) and C(7,3)?

If a2+1=9a, (a≠0) then the value of a2+1a2 is

A, B and C can work together for Rs. 550/- A and B together are to do 7/11 of the work. The share of C should be?

For an article the profit is 170% of the cost price. If the cost price increases by 20% but the selling price remains same, then what is the new profit percentage?

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

From point P, at 6 : 30 pm, a train starts moving towards Q with the speed of 40 km/hr. Another train starts moving from point Q at 7:30 p.m. towards point P at the speed of 60 km/hr. Both of them meet at 11:30 p.m. at point R. What is the ratio of PR and QR?

Rahul can complete a work in 18 days and Sonu can complete the same work in 15 days. If both together work for 5 days, then what part of total work is left?

What is the equation of the line passing through the point (1,3) and making an angle of -45° with the positive x-axis?