The following data shows the sale of watches and sunglasses in a store during six months. Use a double graph for the given data to answer these questions.

	January	February	March	April	May	June
Watches	$500$	$450$	$750$	$250$	$350$	$100$
Sunglasses	$750$	$600$	$550$	$700$	$275$	$350$

In which month was the difference in the sales of watches and sunglasses the maximum?

The following data shows the sale of watches and sunglasses in a store during six months. Use a double graph for the given data to answer these questions.

In which month was the ratio of sale of watches to sunglasses $3:4$?

Who performed better in languages?

In which subject did Siya and Riya score equal marks?

In which subjects was Riya better than Siya?

Find the average marks scored by both the girls and hence compare their performance.

State the following event is certain, impossible or can happen but not certain.

Choosing a yellow marble from a jar containing $2$ red, $3$ blue and $4$ green marbles.

State that the following event is certain, impossible or can happen but not certain.

Landing on a number less than $8$ on spinning a spinner with $7$ equal outcomes numbered $1$ to $7$.

State the following event is certain, impossible or can happen but not certain.

Mathematics teacher of class $\mathrm{VII} \mathrm{B}$ not turning up today.