A student needs an average of at least 60 marks in four tests to pass. If her scores in the first three tests are 50, 48, and 72, what is the minimum score she must get in the fourth test?

Model Answer & Options

Source: Extra Practice

60

70

80

50

Explanation

Let the score in the fourth test be x. The average is (50 + 48 + 72 + x) / 4. We need this to be ≥ 60. So, (170 + x) / 4 ≥ 60. Multiplying by 4: 170 + x ≥ 240. Subtracting 170: x ≥ 70. Thus, the minimum score required is 70. Option 1 is too low (average would be 57.5). Options 3 and 4 are mathematically incorrect relative to the 'minimum' requirement.

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