For the following questions answer them individually
In an examination, the Average marks of 7 children was 20, that of 3 children was 45, that of another 4 children was 15 and that of 2 children was 0. What is the average marks of all the 16 children? (Correct to one decimal place)
A washing machine is sold at a discount of 10% on its marked price. A further discount of 5% on the initial selling price is offered if a person makes the payment in cash. If the marked price of the machine is ₹54,000, how much will a customer paying in cash have to pay for purchasing it?
The length, breadth and height of a room are 7 m, 4 m and 9 m, respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of ₹7.50 per $$m^{2}$$.
Find the selling price of an article if a shopkeeper allows two successive discounts of 5% each on the marked price of ₹80.
If $$\sin\theta=\frac{\sqrt{3}}{2}$$, and $$\theta$$ is an acute angle, find the value of $$\cos3\theta$$.
Simplify $$( 5 \times 5 \times 5 \times 5 \times 5 )^{5} \times(5 \times 5 \times 5 )^{5}\div 5 = (125)^{?}$$.
Study the given graph and answer the question that follows.
For which of the following years was the percentage rise/fall in production from the previous year maximum for country R?