If 3 sin x + 5cosx = 5 then what is the value of (3cosx - 5sinx)

Study the table and answer the questions and give answer the following questions.

In  which year , the difference between the highest and the average marks in maths was maximum?

The sum of three consecutive odd natural numbers each divisible by 3 is 63. What is the largest among them? 

If Sonu is driving a car at a speed of 20m/s, then in how much time Sonu will cover a distance of 936 km?

Profit obtained on selling an article for Rs 540 is equal to the loss incurred on selling the article for Rs 370. if selling price is Rs. 910, Then what is the profit percentage? 

8 men can do a work in 12 days. After 6 days of work, 4 more men were engaged to finish the work. In how many days would the remaining work be completed? 

Two numbers are in the ratio x : y . If 2 is added to both numerator and denominator ,  the fraction becomes $$ 1\over2$$. Find the value of x + y . 

 A 450 meter long train crosses a bridge 650 meters long in 36 seconds. What is speed (in km/hr) of the train?