Question

please tell me the answer it is so urgent and don't spam.​

Answer 1

Answer:

Answer is 93.

let A= Average

so

$a = \frac{x1 + x2...xn}{n}$

So

$340 - 247 = x \\ x = 93$

$85 = \frac{247 - x}{4}$

Answer 2

➤ Answer

• Shamali must score 93 marks to get an average of exactly 85 marks.

➤ Given

• Marks scored by Shamali = 75, 90 and 82 in three mathematics test respectively.

➤ To Find

• The marks she must score in the next test to have an average of exactly 85 marks.

➤ Step By Step Explanation

In the question given that Shamali scored 75, 90 and 82 marks in three mathematics test respectively. We need to find the marks she must score in the next test to have an average of exactly 85 marks.

So let's do it !!

➠ Assumption

Let the marks scored in the next test be x.

➠ Formula

$\underline{\boxed {\tt{Average = \cfrac{Total \: Marks}{Number \: of \: Test}}}}$

➠ By substituting the values

$\longmapsto\tt85= \cfrac{75 + 90 + 82 + x}{4} \\ \\ \longmapsto\tt85 = \cfrac{247 + x}{4} \\ \\ \longmapsto\tt85 \times 4 = 247 + x \\ \\ \longmapsto\tt340 = 247 + x \\ \\\longmapsto\tt 340 - 247 = x \\ \\ \longmapsto\bf{\red{93 = x}}$

Therefore, Shamali must score = 93 marks

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