RRB Group D 3-Dec-2018 Shift 3 Solved Paper

Question : 78 of 100

Marks: +1, -0

The rectangle above consists of five congruent rectangles, the longer side of each being

x

m. If the total area of figure is 7500 m

^2

. What will be the value of

x

Solution:

Let length of each rectangle = x
breadth of each rectangle = y
Also, length of bigger rectangle = 2x = 3y

⇒y={2x}/3

Hence,

l=2x

b=x+2/3x={5x}/3

A=l×b

7500=2x×{5x}/3⇒x^2=2250

∴x=15√{10}

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