Mathematical Sk...

A shopkeeper normally makes a profit of 20% in a certain transaction, he weight 900 grams instead of 1 kg due to an error in weight machine. If he charges 20% less what he normally charges, what is his actual profit or loss percentage?

Two friends set out to meet each other. Mahesh set out from point A downstream to point B with a speed of 20 km/hr and Rajesh set out from point B upstream with a speed of 40 km/hr. If the speed of stream is 10 km/hr and distance between point A and B is 195 km and Mahesh started 30 min before Rajesh. Find the distance at which they meet from point A.

Find the value of \(\frac{\cos x-\sin x+1}{\cos x+\sin x-1}\)

Three friends A, B and C started a business by investing in the ratio of 1/2 ∶ 1/3 ∶ 1/4. At the end of the year, they earned a profit of Rs. 10,400, which is 10% of the total investment. How much did B invest?

Rohit scored 30% marks and failed by 15 marks. Mohan scored 40% marks and obtained 35 marks more than those required the pass percentage is:

Two pipes X and Y can fill an empty tank in ‘t’ minutes. If pipe X alone takes 6 minutes more than ‘t’ to fill the tank and Y alone takes 54 minutes more than ‘t’ to fill the tank, then X and Y together will fill the tank in:

A tank has four pipes, three inlet pipes and one outlet pipe. Each inlet pipe can fill the tank alone in 15 hours and the outlet pipe can empty it in 40 hours. Ram opens 3 inlet pipes simultaneously and went to market. After 1 hour a naughty kid open the outlet pipe and ran away. When Ram came back after 3 hours and saw that the outlet pipe was opened, he close it immediately. Now how much time will it take to fill the tank after closing the outlet pipe?

First number is 35% less and second number is 25% more than the third number then sum of first and second number is how much percent less/more than the third number?

A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In how many days will the three of them together complete the same work?

A large basket of fruits contains 3 oranges, 2 apples and 5 bananas. If a piece of fruit is chosen at random, what is the probability of getting an orange or a banana?