A, B, C and D wrote an exam for a total of
500 marks. A scored 25% more marks
than B, B scored 40% more marks than C
and C scored 60% more marks than D. If
A got 320 marks, what percentage of
marks did D score?
(a) 22.8
(b)21.7
(C) 15.6
(d) 23
Answers
Answered by
1
Answer is 22.8%
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Answered by
1
Answer:
22.8 %
option a is correct
Step-by-step explanation:
Let say D got D marks
C scored 60% more marks than D
=> C Marks = D + (60/100)D = 1.6D
B scored 40% more marks than C
=> B Marks = 1.6D + (4/100)1.6D = 1.6 * 1.4 D
A scored 25% More marks than B
=> A Marks = 1.6 * 1.4D + (25/100) * 1.6*1.4D
= 1.6 * 1.4 * 1.25 D
1.6 * 1.4 * 1.25 D = 320
=> 1.4 * 1.25 D = 200
=> 1.4D = 160
=> D = 800/7
D % Marks = 100 * (800/7) / 500 = 160/7 %
= 22.8 %
option a is correct
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