A. Increased by 4%
B. decreased by 4%
C. Decreased by 1%
D. Remains unchanged
Explanation:
Let length = x metres and breadth = y metres, then area =(xy)
New length =(120/100x)m = 6x/5 m
New breadth =(80/100 y)m
New area =(6x/5 x 4y/5)m2 = (24/25 xy)m2
Decreased in area =(xy – 24/25 xy)m2= xy/25 m2
Decreased % =(xy/25 x 1/xy x 100)% = 4%
Related Mcqs:
- The length of a rectangle is twice its breadth, if length is decreased by 5 cm and the breadth is increased by 5 cm. The length of the rectangle is_________?
A. 20 cm
B. 30 cm
C. 40 cm
D. 50 cm - The ratio of the length and the breadth of a rectangle is 4 : 3 and the area of the rectangle is 6912 sq cm. Find the ratio of the breadth and the area of the rectangle?
A. 1 : 96
B. 1 : 48
C. 1 : 84
D. 1 : 68 - The length of a rectangle is increased by 10 % and breadth decreased by 10 % Then the area of a new rectangle is:_________?
A. neither increased nor decreased
B. increased by 1 %
C. decreased by 1 %
D. decreased by 10 % - The area of a rectangle is thrice that of a square. The length of the rectangle is 40 cm and the breadth of the rectangle is (3/2) times of the square. The side of the square in cm is__________?
A. 15
B. 20
C. 30
D. 60 - The length of a rectangle is two – fifths of the radius of a circle. The radius of the circle is equal to the side of the square, whose area is 1225 sq.units. What is the area (in sq.units) of the rectangle if the rectangle if the breadth is 10 units?
A. 140
B. 156
C. 175
D. 214 - The area of the square formed on the diagonal of a rectangle as its side is 108 1/3 % more than the area of the rectangle. If the perimeter of the rectangle is 28 units, find the difference between the sides of the rectangle?
A. 8
B. 12
C. 6
D. 2 - The length of a rectangle is increased by 25% and its breadth is decreased by 20%. What is the effect on its area?
A. Remains same
B. 5% decrease
C. 5% increase
D. 10% increase - The length of a rectangular increased by 10% and it;s breadth is decreased by 10 %. Then the area of the new rectangle is_________?
A. Neither increased nor decreased
B. Increased by 1%
C. Decreased by 1%
D. Decreased by 10% - The area of a square is 4096 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is twice the side of the square and breadth is 24 cm less than the side of the square.
A. 18 : 5
B. 7 : 16
C. 5 : 14
D. None of these - The perimeter of a rectangle and square are 160m each. The area of the rectangle is less than that it’s square by 100cm meters. The less than that of the square by 100 sq.meters. the length of rectangle is___________?
A. 30m
B. 40m
C. 50m
D. 60m
