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If Mustafa scored 75 instead of 57 for maths his average of four subjects would have...

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christiano-cr7 | (Level 1) Salutatorian

Posted June 28, 2013 at 10:00 AM via web

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If Mustafa scored 75 instead of 57 for maths his average of four subjects would have been 60. What is his total mark.

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted June 28, 2013 at 10:07 AM (Answer #1)

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Let us consider the situation where Mustafa has scored average 60 with 75 marks for math.

So total marks for four subjects `= 60xx4 = 240`

We know he got 75 for math.

So marks of other 3 subjects `= 240-75 = 165`

 

so even he scored 57 marks he has 165 for the other 3 subjects. So the actual mark of Mustafa is `(165+57) = 222`

 

So total mark of Mustafa is 222 marks.

 

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