A goldsmith observes that one of his employees prepares a necklace in 9 hours, while another employee prepares it in 10 hours. If they work together, they stud 10 gems less every hour and thus prepare a necklace in 5 hours, then the number of gems studded in each necklace is: 

The x - intercept on the graph of 7x - 3y = 2 is :

Directions: Read the following information carefully and answer the given questions.
M, A, B, C, Y, and Z are six friends. Each of them has different height. Height of the tallest person is 189 cm. A is taller than only B. Y is shorter than only two people. C is not the tallest. M is neither taller than Z nor shorter than C. The difference between the height of third shortest and the tallest person is 9. M is taller than Y.

How many persons are taller than C?

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

If a chair sold for Rs. 600 at the profit of 20%, then the original price of the chair is: