Question

Section - A (Multiple choice questions) - Answer any Thirty questions (30 x 1 =30 Marks)
OL
The length of rectangle is increased by 80% by what percent would the width have to be decreased to maintain the
same area?​

Answer 1

Step-by-step explanation:

Let y be no. of unattempted questions ξ given x is no. of correctly answered question.

⇒(30−x−y) questions were wrongly answered.

⇒4×x+1×y+0×(30−x−y)=60

⇒4x+y=60 , x≤30,y≤30

And x+y<30

If x=9,y=24

⇒x+y=33>30

∴ No possible

If x=10,y=20

⇒x+y=30

⇒x=11 , y=16

x=12 , y=12

x=13 , y=8

x=14 , y=4

x=15 , y=0

x=16 , y=−4 y cannot be negative.

∴ Only 6 possible values.

Hence, the answer is 6.