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ICSE Class 9 Answered

Asked by | 18 Mar, 2014, 04:58: PM
answered-by-expert Expert Answer
Assuming rate is 20 per 100 sq. m
 
Let the height of a triangular field be h.
Then, the base of a triangular field will be 2.4h.
Area of triangular field
=(1/2) x base x height
= (1/2) x 2.4h x h =1.2 h2 sq. m
Cost of levelling 100 sq. m is 20
Thus, cost of levelling 1.2 h2 sq. m = 20 over 100 cross times 1.2 h squared
According to question,
20 over 100 cross times 1.2 h squared=9600
rightwards double arrow h squared equals fraction numerator 9600 cross times 100 over denominator 20 cross times 1.2 end fraction
rightwards double arrow h squared equals 40000 rightwards double arrow h equals 200

Hence, height = 200 m and base = 2.4 x 200 = 480 m
Answered by | 18 Mar, 2014, 06:13: PM

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