wiz-icon
MyQuestionIcon
MyQuestionIcon
3
You visited us 3 times! Enjoying our articles? Unlock Full Access!
Question

A rectangular sheet of fixed perimeter with sides having their lengths in the ratio 8 : 15 is converted into an open rectangular box by folding after removing squares of equal area from all four corners. If the total area of removed squares is 100, the resulting box has maximum volume. Then the lengths of the sides of the rectangular sheet are

A
24
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
32
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
45
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
60
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 45
Let the sides of the rectangle be 15k and 8k and sides of square be x. Then (15k2x)(8k2x)x is the volume.
V=2(2x323kx2+60k2x)The area of the squares cut is 100 from all four corners.Area of each square is 25 and so side will be 5. x=5.(dVdx)x=5=0(6x246kx+60k2)x=5=06k223k+15=0k=3 or 56.Only k=3 is permissible.So, sides are 45 and 24.

flag
Suggest Corrections
thumbs-up
3
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Extrema
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon