​Two lots of onions with equal quantity, one costing Tk. 10 per kg and the other costing Tk. 15 per kg are mixed together and whole lot is sold at Tk. 15 per kg . What is the profit or loss?

​The diameters of two circles are the side of a square and the diagonal of the square. The ratio of the areas of the smaller circle and the larger circle is :

​Two circles of equal radii touch externally at a point P . Form a point T on the target at P target TQ and TR are drawn to the circles with points of contact Q and R respectively. The relations of TQ and TR is

​A person rides a bicycle round a circular path of radius 50 m. The radious of the wheel of the bicycle is 50 cm. The cycle comes to the starting point for the first time in 1 hour. what is the number of revolutions of the revolutions of the wheel in 15 minutes?

​In covering a certain distance , the speeds of A and B are in the ratio of 3 : 4. A takes 30 minutes more than B to reach the destination. The time taken by A to reach the destination is :

​He is very ___ : he believes anything.