Mr Huang knocked 160 nails along the perimeter of the ceiling of a function room measuring 20 m long by 12 m wide. The distance between each nail was equal. He hung 3 balloons on each nail.
(a) How many nails were knocked along the width of the ceiling?
(b) How many balloons did he buy in all if he has 20 left?
20 + 12 = 32
32 x 2 = 64 m (Perimeter of ceiling)
160/64 = 2.5 (Number of nails per metre)
2.5 x 12 = 30
30 + 1 = 31 (Nails from one corner of the width to the other)
31 x 2 = 62 nails (The ceiling has 2 width)
a) 62 nails were knocked along the width of the ceiling.
160 x 3 = 480
480 + 20 = 500 balloons
b) He bought 500 balloons.
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