A invests Rs.4800 at simple interest scheme at x % per annum for 4 years and after 4 years he received the total amount is Rs.7680. If B invests same amount at simple interest scheme at (x + 3)% per annum for 5 years, find the interest amount received by B?

A started the business with the investment of Rs.4500 and after 4 months B joined with the business. At the end of the year the total profit is Rs.17000 and A’s profit share is Rs.9000, what is B’s investment?

If the difference between the marked price and cost price of the article is Rs.180 and the shopkeeper offers 10% discount while he gets 20% of the profit, what is the marked price of the article?

A boat travels 120 km downstream in 6 hours and the speed of the stream is 5 kmph. What is the speed of the upstream?

If the circumference of the circle is 132 cm and the radius of the circle is equal to the length of the rectangle whose perimeter is 80 cm, find the area of the rectangle?

There is a group of 4 doctors and 6 teachers. If 4 persons are to be selected, in how many different ways can they be selected such that at least one teacher should be there?

Two stations A and B are 310 km apart on a straight line. One train starts from A at 10 a.m. and travels towards B at 40 km/hr. Another train starts from B at 11 a.m. and travels towards A at a speed of 50 km/hr. At what time will they meet?

A basket contains x apple, 4 orange and 3 banana. One fruit is taken out randomly and the probability of getting an orange is 2/5, and find the value of x?

Ram scored 20% more than Rakesh and Rakesh scored 25% less than Ritesh in an exam having 200 as maximum marks. If Ritesh’s marks is 16 more than Ram’s marks, what is the percentage marks obtained by Rakesh?

A shopkeeper sold two variety of rice, he mixes 20 kg of rice of Rs.50 per kg with 40 kg of rice of Rs.35 per kg. If he earned the profit of 20%, then what is the selling price of the mixed rice per kg?