Rashid spent ₹ 35.75 for Maths book and ₹ 32.60 for Science book. Find the total amount spent by Rashid.

The bookshop of a particular school has 10 dozen chemistry books, 8 dozen physics books, 10 dozen economics books. Their selling prices are Rs. 80, Rs. 60 and Rs. 40 each respectively. Find the total amount the bookshop will receive from selling all the books using matrix algebra.

A person writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with instruction that they move the chain similarly. Assuming that the chain is not broken and that it costs 50 paise to mail one letter. Find the amount spent on the postage when 8th set of letter is mailed.

In a development plan of a city, a contractor has taken a contract to construct certain houses for which he needs building materials like stones, sand etc. There are three firms A, B, C that can supply him these materials. At one time these firms A, B, C supplied him 40, 35 and 25 truck loads of stones and 10, 5 and 8 truck load of sand respectively. If the cost of one truckload of stone and sand are Rs 1200 and 500 respectively, then find the total amount paid by the contractor to each of these firms A, B, C separately.

Mohan had brought certain number of books for rupes 48, If he had bought 4 more for the same amount , then the cost of each book would have been reduced by 1 rupee . Find the number of books bought by him.

Aniruddha bought some books for rupes 60 . He had bought 5 more books for the same amount ,each books would have cost him 1 rupees ,less than . Find the number of books bought by Aniruddha.

If a shopkeeper bought 250 books for 75 each.He spent ₹500 on the binding of books.Then he sold it in ₹ 2000.Calculate the profit or loss percentage.

In a legislative assembly election, a political group hired a public relations firm to promote its candidate in three ways: telephone, house calls, and letters. The cost per contact (in paise) is given in matrix A as A=overset("Cost per contact")([(,40,),(,100,),(,50,)]){:("Telephone"),("Housecall"),("Letter"):} The number of contacts of each type made in two cities X and Y is given by B=overset("Telephone Housecall Letter")(" "[(1000,500,5000),(3000,1000,"10,000")]){:(toX),(toY):} . Find the total amount spent by the group in the two cities X and Y.

Galileo , in his book Two new sciences , stated that for elevations which exceed or fall short of 45^(@) by equal amounts , the ranges are equal . Prove this statement.

Find the empirical formula of a compound which contain 33.18% of carbon,4.60% of hydrogen, 29.49% of oxygen and 32.72%of chlorine(At masses: C=12, H=1. O=16, Cl=35.5)