Elitmus Exam Category

Chottu scores 80% marks on an average in 5 subjects in the 1st term xam,his individual subjects scores are always even no lie between 50-100(both inclusive)out of a max score of 100.All terms have 5 subjects,& all subjects have equal weight age.He does not get the same marks in any 2 subjects across terms.How many max no of terms
can his average remain xactly 80%?
Options:5,4,2,1

Read Solution (Total 3)

60,64,80,96,100
58,82,84,86,90
72,74,76,80,98
56,70,88,92,94
ans=4
10 years agoHelpfull: Yes(5) No(4)

kindly explain...the process shown is brute force method...tell any specific formula based solution
10 years agoHelpfull: Yes(2) No(0)
76, 78, 80, 82, 84
60,64,80,96,100
58,82,84,86,90
72,74,76,80,984
ans =5
56,70,88,92,9
10 years agoHelpfull: Yes(0) No(5)

Elitmus Other Question

Four mirrors are erected perpendicular to the ground to form a rectangle ABCD.The longer mirror are facing inwards & negligible gap between the corners.A laser beam is shot at mirror BC through the gap of point A,in a plane parallel to the ground.
i)How many lines will the laser beam bounce of a mirror surface before exiting the rectangle from point C.If the beam travels a total distance of 25cm inside the rectangle?
options:5,4,3,none

ii)How many times will the laser beam bounce mirror surface before exiting the rectangle from point A.if the beam travels shortest possible distance inside the rectangle?
options:22,15,4,none. Let y={(1+ai)/(b-i)}^x,where a,b,x & y are integers.It is known that x is an even number greater than 100 but not divisible by 4.Which of the following statements will always the true?
(a)both a & b are +ve but nt equal
(b)both a & b are -ve are nt equal
(c)both a&b are prime numbers and nt equal
(d)both a&b can take any values as long as they are equal