The sum of the present ages of father and son is 90 years. 10 years earlier the ratio of their ages was 5:2. The present age of the father is:

A person spends 25% of his annual income on house rent, 15% on education of children and 45% on other items. If he saves INR 14400 annually, then the person's total income is:

A man sells an article at a loss of 10%. If he had sold it for INR 75 more he would have gained 20%. The cost price of the article is (in Rs.):

A merchant buys 20 kgs of a variety of rice at INR 14 per kg and another 40 kgs of rice at INR 10 per kg. He mixes them and sells 1/3  of the mixture at INR 12.50 per kg. At what rate should he sell the remaining mixture so as to earn a profit of 25% on the whole outlay

A litre of water weights a kilogram, a litre of another liquid weights 1.340 kilograms. A mixture of the two weights 1.270 kilograms per litre. The ratio of their volumes in a litre of the mixture is:

The average monthly sale (in lakhs) is: