If Sachin secures 70% marks in mathematics and 60% in science, what percentage of marks did Sachin get in both subjects together, assuming both subjects to have equal maximum marks?
C. Chlorophyll, sunlight, carbon dioxide and water
5.
X and Y can complete a piece of work in 16 days, Y and Z can do the same piece of work in 24 days. X, Y and Z together can do it in 12 days. How much time will X and Z take to finish it?
The number of girls in a class is seven times the number of boys. Which of the following numbers CANNOT represent the total number of children in the class?