Directions:Study the following table carefully to answer these questions:

Percentage of Marks obtained by six students in six subjects

What are the average marks obtained by all the students in Maths ?

Costs of two articles were in the ratio of 16: 23. The cost of first articles increases by 10% and that of second by Rs.477. Now the costs of two articles are in a ratio of 11: 20. The price of the second article (in Rs.) in the beginning was-

If 80 litres of milk solution has 60% milk in it, then how much milk should be added to make milk 80% in the solution?

A reduction of 20 % in the price of salt enabled a purchaser to obtain 4 kg. more for Rs. 100. The reduced price of salt per kg is :

If a person purchases a shirt, he gets 6 % discount. However, if he purchases two shirts, he gets 5 % on the first and 8 % on the second. If the price paid by the person for two shirts is ₹ 925, then what will be the marked price of each shirt? 

Train A crosses a stationary train B in 35 seconds and a pole in 14 seconds with the same speed. The length of the train A is 280 metres. What is the length of the stationary train B?

At present, the sum of the ages of A, B and C is 150 years, whereas 10 years ago, the ratio of their age was 5:4:3. Find the ratio of their ages 10 years hence.