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Numerical Inequalities · Question 64 of 79

Question 64

EasyOriginal question

A student scored 62, 75 and 68 in three tests. What is the least she must score in the fourth test for her average to be at least 70?

Options for question 64

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. 62+75+68+x4≥70\frac{62 + 75 + 68 + x}{4} \ge 70, so 205+x≥280205 + x \ge 280.

  2. x≥75x \ge 75.

Worth noting

70 is the target average, not the score needed.

Concept
An average as an inequality
Typical time
60 s
Your time
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The rule this testsInequalities from situations
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