In your class, you have scores of 78,86,92 and 94 on the first four of five test. To get a grade of a B, the average of the first five tests scores must be greater than or equal to 80 or less than 90

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Ответ:

litzy90

19.05.2020

Mathematics

C. 2.52

Step-by-step explanation:

Let x be the first number,

Since, the another number = $\frac{3}{8}$ of the first number

$=\frac{3x}{8}$

According to the question,

$x-\frac{3x}{8}=4.2$

$\frac{8x}{8}-\frac{3x}{8}=4.2$

$\frac{8x-3x}{8}=4.2$

$\frac{5x}{8}=4.2$

5x=33.6

$x=\frac{33.6}{5}$

$\implies x=6.72$

Hence, first number is 6.72,

And, second number = $\frac{3}{8}(6.72)=\frac{20.16}{8}=2.52$

⇒ Lesser number is 2.52

Option C is correct.

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