A calculus problem by Muhammad Tahir

Calculus Level 1

Mr. Kashif got an average of 50 in 6 tests. What should he get in the next test to attain the the average of 60?

60 70 100 120

Muhammad Tahir by Muhammad Tahir , 28, Pakistan

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3 solutions

Khaled Mohamed
Jun 24, 2014

a v e r a g e = S u m O f S c o r e s N u m b e r O f . T e s t s average=\frac{Sum Of Scores}{Number Of. Tests}

Then

s 6 = 50 \frac{s}{6}=50

s=300

Also

s + x 7 = 60 \frac{s+x}{7}=60

300+x=420

x=120

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Clavin Rali
May 5, 2015

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Deepak Joshi
Jun 23, 2014

Total marks he scored in 6 tests are 300. To make average of 60 in 6+1 tests he must score 420 in total. So 120 in last test.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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