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.

Study the following graph to answer these questions :
Percent profit earned by two companies A & B over the years.
Profit = Income – Expenditure

If the expenditure of Company A in 1997 was Rs.70 lakhs and income of Company A in 1997 was equal to its expenditure in 1998, what was the total income (in Rs. lakh) of the Company A in 1997 & 1998 together?