Question

length of a rectangle is 5 less than twice its breadth if its perimeter is 110, then find the area of the rectangle use cross multiplication method for the solution

Answer 1

Hey mate!!!!!
Let breadth be x
so length = 2x - 5
now perimeter = 2(l+b) = 110 given
so
$2(2x - 5 + x) = 110 \\ 2(3x - 5) = 110 \\ 3x - 5 = \frac{110}{2} \\ 3x - 5 = 55 \\ 3x = 55 + 5 \\ 3x = 60 \\ x = \frac{60}{3} \\ x = 20$
There is no cross multiplication.
Now we know breadth = 20
length = 2 × 20-5
= 40-5
= 35

area = l × b
$20 \times 35 = 700$
hope it helps dear friend ☺️✌️✌️