Answer: lenght is 50yrds, width is 30yrds
Explanation:
Perimeter of a pool = 2( lenght x breadth)
Perimeter = 160yrds
If the lenght is 10yrds less than twice the width then,
lenght = 2w - 10,
Where w is the width
Then from p = 2(L + w)
160 = 2( 2w - 10 + w)
160 = 2(3w - 10)
160 = 6w - 20
160 + 20 = 6w = 180
width w = 180/6 = 30yrds
From p = 2(L + w)
160 = 2(L + 30)
160 = 2L + 60
160 - 60 = 2L = 100
L = 100/2 = 50yrds