GMAT Quantitative Reasoning Practice Test 2

Question : 89 of 100

Marks: +1, -0

In the faculty of Reverse-Engineering, 226 second year students study numeric methods, 423 second year students study automatic control of airborne vehicles and 134 second year students study them both. How many students are there in the faculty if the second year students are approximately

80 \%

of the total?

Validate

Solution:

Use the group formula.
Total

=

group

A+

group

B-

Both + Neither.
Total

=226+423-134+0=515

second year students.
The second year students are

80 \%

of the total amount, therefore,

515 / 80 × 100=643.75

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