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3 years ago

14

after spending 7/9 of a three hours examination, a student left the exams hall. How many minutes has he to complete the duration

of the examination.

1 answer:

Montano1993 [528]3 years ago

6 0

40 mins left! total time= 60 mins x 3 hours =180 mins. 180 divided by 9 is 20. 20 times 7 is 140. 180-140 equals 40. yay!

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Answer:

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Step-by-step explanation:

We have been a quadratic equation:

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We have a formula to find zeroes of a quadratic equation:

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Therefore, $x=\frac{50+\sqrt{31}}{2},\frac{50-\sqrt{31}}{2}$

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