7 × 7 of 3 ÷ 3 -14 × P=7, then find out the value of P?

A person can buy a refrigerator for Rs.15,850 on cash payment or in installments for every year at 10% p.a for four years compounded annually. What is the approximate annual installment that he should pay?

Simplification the following equations shown below

 A student scored 32 % marks in science subjects out of 300. How much should he score in language papers out of 200 if he is to get overall 46 % marks? 

Speed of boat in upstream is 11km/hr and downstream is 23 km/hr find the speed of boat in still water?

A copper wire is bent in the shape of a square of area 81 cm². If the same wire is bent in the form of a semicircle, the radius (in cm) of the semicircle is (take π=22/7 ) 

Find the area of quadrilateral formed by joining points (4,2), (8,2), (8,14) and (4,10).