Joel purchased 40 notebooks at the rate of Rs. 18 per notebook and 55 pencils at the rate of Rs. 8 per pencil. What is the total amount that he paid to the shopkeeper ?

The average of five numbers is 34.4. The average of the first and the second number is 46.5. The average of the fourth and the fifth number is 18. What is the third number ?

The ratio between Gloria's and Sara's present ages is 4 : 7 respectively. Two years ago the ratio between their ages was 1 : 2 respectively. What will be Sara's age three years hence ?

A plot of 1800 sq. ft. is available at the rate of ` 630 per sq. ft. If 45% of the total cost of the plot is to be paid at the time of booking it, how much is the booking amount?