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The average of a group of 9 numbers is 51. If the first four numbers have an average of 47 and the last four numbers have an average of 55, what is the fifth number?

The average salary of a team of 90 employees is ₹58,000. If the average salary of 40 of them is ₹68,000, what is the average salary of the remaining employees?

The average of x and y is 60. The average of x, y and z is 80. What is the average of x, y and 2z?

The average age of 5 students in a class increases by 2 years when a 40-year-old teacher joins them. What was the original average age of the students?

The average weight of 12 boxes is 18 kg. If the heaviest box weighs 24 kg and the lightest weighs 12 kg, what is the average weight of the remaining boxes?

Three classes have average ages 16, 18 and 21 respectively. The number of students in the three classes is in the ratio 3 : 4 : 5. What is the overall average age of all the students together?

The overall average salary for all employees in an office is ₹32,000. Officers earn an average salary of ₹56,000, while non-officers make an average of ₹20,000. If there are 17 officers, determine the number of non-officers.

A train covered a certain distance in 3 parts with average speeds of 12 km/h, 15 km/h and 30 km/h. What is the average speed over the entire journey, assuming equal distances?

The average marks of 40 students in a class is 72. If the marks of one student were wrongly entered as 92 instead of 72, what is the CORRECT average?

A person walks 10 km to a destination in 2 hours. On the return journey, they walk the same 10 km back in 1 hour. What is the average speed for the entire journey?

A chemist prepares 80 litres of antiseptic solution by mixing two liquids 'A' and 'B' in the ratio 3 : 5. If the cost of 'A' is ₹55 per litre and 'B' is ₹40 per litre, what is the approximate average cost per litre of the final solution?

Rajesh covers one-third of his journey at a speed of 10 km/h, the next one-third at 20 km/h and the remaining part at 60 km/h. What is his average speed?

A trader bought 5 varieties of rice whose weights are in the ratio 3 : 4 : 5 : 6 : 7. Their respective prices per kg are ₹42, ₹45, ₹47, ₹48 and ₹50. What is the average cost per kg of the mixture?

A delivery van travels at a constant speed of 84 km/h to cover a certain route in 1 hour and 45 minutes. If traffic increases the time taken by 15 minutes, by what percentage must the van's average speed decrease to complete the route?

Amit walks at 10 km/h for 12 km and at 12 km/h for 16 km. What is his average speed?

The average of three numbers is 44. The first number is 25% more than the second, and the third is 25% less than the second. What is the second number?

Identify the INCORRECT statement about road density in India. A. Economic growth and terrain influence the density of roads in different regions. B. North-Eastern states have a higher road density than Southern states. C. Kerala's road density exceeds the national average.

A car covers three equal distances at speeds of 60 km/h, 90 km/h and 180 km/h respectively. What is the average speed of the car for the entire journey?