Question

the length and the breath of a rectangular field are in the ratio 7:4. the cost of fencing the field at Rs. 25 per meter is Rs. 3300. Find the dimensions of the field.

Answer 1

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Let the length be 7x and breadth be 4x 
2(7x+4x)25 = 3300
50 × 11x = 3300
11x = 3300÷50
11x = 66
x = 66÷11
x = 6
So length is 7×6=42cm and breadth is 4×6=24 cm.

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Answer 2

Let the length be 7x and breadth be 4x  

2(7x+4x)25 = 3300

50 × 11x = 3300

11x = 3300÷50

11x = 66

x = 66÷11

x = 6

So length is 7×6=42cm and breadth is 4×6=24 cm.