Question

A rectangular plot is 60 metre wide and its perimeter is 320 metre if playing of grass cost to be 7.50 per square metre how much would it cost for blast will in the field living a bear 4 metre wide all around

Answer 1

$let \: the \: breadth \: of \: plot \: be \: x \: \\ perimeter \: of \: rectangular \: plot \\ 320= 2(l + b) \\320 = 2(60 + x) \\320 = 120 + 2x \\ 320 - 120 = 2x \\ 200 = 2x \\ \frac{200}{2} = x \\ x = 100$

$area \: of \: plot = l \times b \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 60 \times 100 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 6000 {m}^{2}$

$cost \: of \: grassing \: 6000 {m}^{2} of \: land \\ \: \: \: \: \: \: = 6000 \times 7.50 \\ = rs \: 45000$

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