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**16**. area of the carpet is 8×5 = 40 m²

and area of the border = 12 m²

area without border = 28 m²

it is equal to (L -2W)(B - 2W)

A/q

(L -2W)(B - 2W) =28

⇒LB -16W -10W +4W² =28

⇒40 -16W -10W +4W² =28

⇒4W² -26W +12 =0

⇒2W² -13W +6 =0

⇒2W²- 12W -W +6 =0

⇒2W(W- 6) -1(W-6) =0

⇒(2W-1)(W-6)=0

⇒

**W =0.5 m as 6m is more than the breadth**

**19.**

area of the walls = 7560/30 = 252 m²

floor area = 1620/15 =108 m²

∴L×B = 108 m²

⇒B = 9 m

now area of four wall = 2LH + 2BH = 252

⇒2H (L +B ) =252

**⇒H =252/42 = 6m**