Advertisements
Advertisements
Question
The cost of harvesting a square field at ₹ 900 per hectare is ₹ 8100. Find the cost of putting a fence around it at ₹ 18 per meter.
Solution
As, the rate of the harvesting=₹900 perhectare
And, the cost of harvesting= `Rs 8100`
So, the area of the square field=`8100/900=9` hectare
⇒ the area= 90000`m^2`
⇒ `"(side)"^2=90000 `
⇒`" side"= sqrt9000`
So, side =300m
Now, perimeter of the field =`4xx "side"`
=`4xx300`
= `1200 m`
Since, the rate of putting the fence=₹18 per m
So, the cost of putting the fence = `1200xx18= Rs 21600`
APPEARS IN
RELATED QUESTIONS
A rectangular park 358 m long and 18 m wide is to be covered with grass, leaving 2.5 m uncovered all around it. Find the area to be laid with grass.
A wire can be bent in the form of a circle of radius 56 cm. If it is bent in the form fo a square, then its area will be
The area of a circle whose area and circumference are numerically equal, is
The area of a sector whose perimeter is four times its radius r units, is
If π is taken as `22/7` the distance (in metres) covered by a wheel of diameter 35 cm, in one revolution, is
The perimeter of a certain sector of a circle of radius 6.5 cm in 31 cm. Find the area of the sector.
In the given figure, ∆ABC is right-angled at A. Semicircles are drawn on AB, AC and BC as diameters. It is given that AB = 3 cm and AC = 4 cm. Find the area of the shaded region.
A chord of a circle of radius 14 cm a makes a right angle at the centre. Find the area of the sector.
Find the area of a circle of radius 30 cm (use π = 3.14).
The area of a circle is 154 cm2. Its diameter is ____________.
