This one is a really tricky question. Took me some time to understand what is asked.

Basically question is giving all the percentages, and asking you to tell the exact number.

This table represents the given data (30% of 60% is 18%)

Question is asking how many students does 18% represent.

1. We are give x+18% is 90.

We can't find how much is 18% from this.

Insufficient

2. Here we are given 18+y% is 90.

We still can't find.

Insufficient.

Both.

Even after using both. We would not be able to find the values of x,y,z.

The statements just help us understand how many students do these percentages represent. Without there values, we can't tell how many is 18%.

E.

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