1) A student took a number of tests, for one particular test he got 68 marks.His average mark for all the tests he took was 91, on average. Then while calculating, he realised he scored 86 instead of 68, and because of this, his average goes up to 92. How many test he took in total? You don need paper and pen to do. You cannot use calculators.
2)what is the answer for
(a-x)(B-x)(c-x)......................(y-x)(z-x)=?
I managed to get the first one right but the second one is tricky. The answer shall be revealed in the next post.
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Happy Boxing day!!
2 comments:
ans to the 2nd question is zero
correct...and you are? :>
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