Meena wishes to start a 78sq m rectangular flower garden Since she has only 20m barbed wire she fenc...........

Quantitative Aptitude ( CCS) Mensuration 2D

Meena wishes to start a 78sq m rectangular flower garden. Since she has only 20m barbed wire, she fences three sides of the garden letting her house compound wall act as the fourth side fencing. The dimension of the garden is ?

12m*3m

26m*3m

16m*13m

20m*11m

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Explanation:

Answer – 26m*3m
Explanation :
L =20 – 2b
area of the garden = 78 sq m,
L * b =78
b*(20-2b) = 78
20b – 2b2 = 78
b2 -10b+ 39 =0
b= 3 b=13
b = 3 then L = 26
b=13 then L = 6
Dimension = 26m * 3 m = 78 sq m