Directions:Study the following table carefully to answer these questions:

Percentage of Marks obtained by six students in six subjects

What is the ratio between total marks obtained by D in Biology, Maths and English together and the total marks obtained by F in these subjects together respectively?

A clock runs fast by 5 mins per hour. If the clock was set right at 12 noon and the clock shows 6.30 p.m. now, what is the right time? 

Directions : What should come in place of the question mark (?) in the following number series? 

87 89 95 107 ? 157 

If a sailer sails 12 km distance within 5 hours against the flow of a river. If he sails 22 km distance in same time along the flow of the river. Then velocity of the river is _______

What is the value of x and y in these equations 7x-2y=8 and 3x+4y=18.

AB is a chord to a circle and PAT is the tangent to the circle at A. If ∠BAT=75° and ∠BAC=45° and C being a point on the circle, then ∠ABC is equal to

A certain amount of money is lent out at compound interest at the rate of 20% per annum for two years, compounded annually. It would give Rs. 482 more if the amount is compounded half yearly. Find the principal.