56) The length of a rectangle is twice it's breadth. If it's
length is decreased by 5 cm and breadth is increased
by 5 cm, the area of the rectangle is increased by 75
am2. Then the length of the rectangle is
a) 20 cm
b) 30 cm
c) 40 cm
d) 50 cm
Answers
Answered by
0
Answer:
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Step-by-step explanation:
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Answered by
0
Answer:
C)40 cm
Step-by-step explanation:
Let breadth=x
⇒ Length=2x
⇒ Area of rectangle=2x×x
=2x
2
After the given changes;
length=2x−5
Breadth=x+5
Area=2x
2
+75
⇒(2x−5)(x+5)=2x
2
+75
2x
2
−5x+10x−25=2x
2
+75
5x=75+25=100
⇒x=20
⇒ Breadth=20cm
Length=40cm.
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