please someone answer this question correctly...it's correct answer is option D...But i need step by step explanation
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1
30%/40% = 30/ 40
= 6/8
= 3/2
= 40 + 25 + 100
= 165 + 80
= 245
= 245 × 3/2%
Answered by
1
Answer:
D
Step-by-step explanation:
Wrong = -1
Correct = 2
Let attempted questions be X by Ram
Let attempted questions be Y by Shyam
Let Passing marks be P
X + Y =100 ---------(1)
Ram: (0.7X)(2) + (0.3X)(-1)= P+ 40
=> 1.4X – 0.3X = P + 40
=> 1.1X = P +40 ----------------(2)
Shyam: (0.6Y)(2) + (0.4Y)(-1) = P + 25
1.2Y – 0.4Y = P + 25
0.8Y = P + 25 --------------(3)
From 2 & 3,
1.1 X – 0.8Y = 15 --------------(4)
(4)x10
11X – 8Y = 150 - ------------(4)
8x(1) + (4) =>
19X = 150 + 800
19X = 950
X= 50
Y = 50
Putting X in (2)
P = 15
Max Marks = 80x2= 160
Marks secured = 55
Marks % = 55/160 = 0.34375= 34.375%
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