Question

The length of a rectangular floor is three times its breadth. If Rs.750 is required to paint the
floor at the rate of Rs.10 per square metre, what is the length of the floor?
a) 19 metres b) 18 metres c) 17 metres
d) 15 metres e) 13 metres

Answer 1

Hii..
Here is your answer..

Solution:-
Rate of painting=₹750
Rate per sq meter= ₹10

So,

Area of rectangular floor =
$= > \frac{750}{10} \\ = > 75 \: sq.m$
Now,
Let the Breadth be x.
So,Length is thrice the breadth=3x

A/q
$= > 3x \times x = 75 \\ = > 3 {x}^{2} = 75 \\ = > {x}^{2} = \frac{75}{3}$
$= > {x}^{2} = 25 \\ = > {x}^{2} = \sqrt{25} \\ = > x = 5$
Therefore,
Breath of rectangular floor is x=5m
And length =
=>3x
=>3×5
=>15m

Hope it helps uh...