1.) If the length of a rectangle is increased by 20 % and its breadth is decreased by 10 % .What change will happen to its area. ?
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Answers
Answered by
1
Answer:
Area will increase by 8 %
Step-by-step explanation:
Let the length & breadth of rectangle be a & b
Area(original)=ab
New length=a+
100
20
a=
100
120
a
New breadth=b−
100
10
b=
100
90
b
Area(new)=
100
120
×
100
90
ab=
100
108
ab=ab+
100
8
ab
∴ Area increased by 8%.
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Answered by
4
Answer:
let the length be X and breadth be y
now Their area = xy
after increase in length by 20%, length= X + X × 20/100 = 120X/100
after increase in breadth by 10% , breadth= y + y × 10/100 = 110Y/100
now area = 120x/100 × 110y/100 = 132xy/100
increase in area = 132xy/100 - xy = 32xy/100
percentage of increase in area = [32xy/100 × 100]/ xy = 32 %
hence the area is increased by 32%!!
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