The line graph shows the number of deaths due to heart attacks in a certain state. Study the diagram and answer the following questions.

What was the difference in the number of deaths between the years 2017 and 2013?

The line graph shows the number of deaths due to heart attacks in a certain state. Study the diagram and answer the following questions.

A person crosses a 900 metres wide road in 120 seconds. What is his speed (in km/hr)?

Two pipes X and Y can fill an empty tank in 16 hours and 20 hours respectively. Pipe Z alone can empty the completely filled tank in 25 hours. Firstly both pipes X and Y are opened and after 6 hours pipe Z is also opened. What will be the total time (in hours) taken to completely fill the tank?

What is the value of 128 + 7232

On Selling a toy at 20/31 of the marked price there is a loss of 20%. What will be the ratio of marked price and cost price of the toy?

Cost price of a refrigerator is Rs 13400. If loss percentage is 4%, then what is the selling price (in Rs) of the refrigerator?

If the time increases by 7 years, then simple interest increases by Rs 8400 on a sum of Rs 6000. What is the rate (in percentage) of interest per annum?