If the price of petrol increases by 19% and Sunitha intends to spend only an additional 12 % on petrol, by what percent should she reduce the quantity of petrol purchased?

Which of the following is used to measure obesity? 

A class of boys stands in a single line. One boy is nine tenth in order from both the ends. How many boys are there in the class? 

Investors sentiment towards (1)/ India has soured in recent years(2)/as economic growth slowed(3)/ to less by 5% in current fiscal year to 8% in 2007 (4)/ No error (5). 

Three bottles of equal capacity are containing a mixture of milk and water in ratio 1: 3, 3: 5 and 11: 5 respectively. These three bottles are emptied into a large bottle. What is the ratio of milk and water respectively in this large bottle?