A trader marks his goods at 20% above cost price. If he allows a discount of 5% what is his final profit%?

If $${b\over a}=0.7$$ find the value of $${a-b\over a+b}={11\over34}.$$

Rehman walks at 8 km/hr and Roma cycles at 13 km/hr towards each other. What was the distance between them when they started if they meet after 36 minutes?

If the circumradius of an equilateral triangle be 10 cm, then the measure of its in-radius is

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

A shopkeeper bought 25 kg. of pulses at the rate of Rs. 54 kg. He sold forty percent of the total quantity at the rate of Rs. 50 per kg. at what price per kg should he sell the approximately quantity to make 25% overall profit ?

Let x be the least number which when divided by 8, 12, 20, 28, 35 leaves a remainder 5 in each case. What is the sum of digits of x? 

In an isosceles triangle, if the unequal angle is twice the sum of the equal angles, then each equal angle is