N a science class, 18 read physics, 25 read mathematics 23 read chemistry, 9 read physics and mathematics, 10 read mathematics and chemistry 6 read physics and chemistry. If there were 50 students all together and 5 students did not read any of the three subject, then how many students read All the three subject then how many students read mathematics only and how many students read chemistry but not mathematics and how many students read physics and chemistry but not mathematics

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step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

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step-by-step explanation: