Directions: Study the graph carefully and answer the following questions.

Find the respective ratio of the number of students in school D and school F.

The value of a mobile phone depreciates at the rate of 10% every year. It was purchased 3 years ago. If its present value is Rs. 6561/-, its purchase price was.

Direction: Study the line graph carefully to answer the following questions.
Line graph shows the production (in thousand units) and percentage of exported mobiles, computers and laptops.

If the ratio between export prices of Mobiles, Laptops and Computers are 2: 1: 1.5 in the year 2014, then what is the proportion of their export earnings? 

In △PQR, ∠P = 90°. S and T are the mid points of sides PR and PQ, respectively. What is the value of RQ²/(QS²+ RT²)?

If N:38∷ 3:57, Find N.

The HCF of two numbers is 4 and the two other factors of LCM are 5 and 7. Find the smaller of the two numbers.

Directions : Given here is a pie chart showing the cost of gold in 2010, 2011, 2012 and 2013. Study the chart and answer the following questions

The ratio of the price of gold in the two years 2010 and 2013 is

If in a triangle the circumcentre, incentre, centroid and orthocentre are at the same place, then what will that triangle be like?