Question

the perimeter of rectangle is 50cm. if it's breath is 10cm find length ​

Answer 1

we know that perimeter of square 2(l+b)
[where l is length and b is breadth ]
2(l+b)
2(10+b)=50
10+b=25
b=25-10
b=15

Answer 2

perimeter=2/length +breath

50=2/

$(2 \times (length + breath) \\ 50 = 2 \times (x + 10) \\ 50 = 2x + 20 \\ 50 - 20 = 2x \\ 30 = 2x \\ x = 30 \div 2 = 15$

$30 = 2x \\ x = 15$