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ryzh [129]
4 years ago
10

97+(-27)+(-89)+(-54)

Mathematics
1 answer:
RUDIKE [14]4 years ago
8 0

Step 1:

97+(-27)+(-89)+(-54)

Step 2:

= 97 - 27 - 89 - 54

Info:

(+) ×(-)=-

Step 3:

= 97 - 170

Step 4:

=  - 73✓

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The total number of students who studied only two subjects is 13.

The given parameters:

  • <em>Total number of students, n = 55 </em>
  • <em>Number of physics students = 21</em>
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  • <em>Number of students for the 3 subjects, = x</em>
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The number of students who studied only two subjects can be determined by applying overlapping three sets formula as shown below;

Total = n(phy) + n(geo) + n(econ) + n(none)- n(double) - 2(all \ subjects)\\\\55 = 21 + 24 + 23 + 2x-n(double) - 2(x)\\\\55 =  68- n(double)\\\\n(double) = 68-55\\\\n(double) = 13

Thus, the total number of students who studied only two subjects is 13.

Learn more about overlapping three sets here:  brainly.com/question/2041029

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