correct answer is: a) Class seven

Explanation

In class seven,
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
In class six,
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
Now, we get two fractions which are KaTeX parse error: KaTeX doesn't work in quirks mode. and KaTeX parse error: KaTeX doesn't work in quirks mode.
We should find the LCM of the denominator.
So, The LCM of KaTeX parse error: KaTeX doesn't work in quirks mode. and KaTeX parse error: KaTeX doesn't work in quirks mode. is KaTeX parse error: KaTeX doesn't work in quirks mode.
Now,
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode. Class seven has the greater participation.
Ans: Class seven.

These precise math questions can also be expressed as:

1. In a sit and draw competition, 90 students from a total of 150 in class seven and 80 students from a total of 140 in class six took part. Which class had a greater number of participants?
2. From a pool of 150 students in class seven, 90 participated in a sit and draw competition, and from a pool of 140 students in class six, 80 participated. Which class demonstrated higher participation in the competition?
3. Among the students of class seven, 90 out of 150 participated in a sit and draw competition, while in class six, 80 out of 140 participated. Which class exhibited greater participation in the competition?