Question

the length and breadth of a rectangular field is the 7 ratio 5 . if the length of the field is 70 ,find the cost of fencing the field at the rate of the 8 rupees per metre.​

Answer 1

Answer:

$ratio \: of \: lenghth \: and \: breath \: = \: raio \: of \: their \: original \: lengths \\ \\ \frac{7}{5} = \frac{70}{breadth} \\ breadth = 50m \\ now \: the \: cost \: of \: fencing \: = \: rs.8 \times 2(l + b) \\ = 16(120) \\ cost \: of \: fencing \: = \: rs.1920$