Part C - Elementary Mathematics
If the average marks of three sections of Class IX, having 30, 45 and 50 students, respectively, is 80, 75 and 90, then the average marks of all the students of Class IX, is:
To finish a work in 8 days, 10 men are required, or 15 women are required. If 'x' men and 'y' women are required to finish the work in 12 days, then which of the following equations is correct?
Ashok has ₹1612 with him. He divided it amongst his sons Raj and Varun and asked them to invest it at 8% rate of interest compounded annually. It was seen that Raj and Varun got same amount after 16 and 17 years respectively. How much (in ₹) did Ashok give to Raj?
Two trains are moving in opposite directions at speeds of 140 km/h and 80 km/h. The length of one train is 340 m. The time taken by them to cross each other is 11 seconds. The length (in m) of the other train, correct to 2 decimal places, is:
A man plans to travel a total distance of 60 km in 6 hours, covering part of the journey on foot and the rest by bicycle. His walking speed is 6 km/hr, and his cycling speed is 12 km/hr. How much distance (in km) does he cover on foot?
