Question

Andy Mann is building a garden fence out of planks. The planks are 15 cm wide to the nearest cm. He needs to make 61m of fencing altogether, correct to the nearest metre.

Answer 1

Andy Mann needs 407 planks to build 61m of garden fence, correct to the nearest meter.

To calculate the number of planks Andy Mann needs to build the fence, we need to find out how many planks he needs per meter of fencing. Since each plank is 15 cm wide, we need to convert that to meters:

15 cm = 0.15 m

Therefore, each meter of fencing requires:

1 m / 0.15 m/plank = 6.67 planks (rounded to two decimal places)

To find out how many planks Andy needs to build 61m of fencing, we can multiply the number of planks per meter by the total length of fencing:

6.67 planks/m x 61 m = 406.87 planks

Since we can't buy part of a plank, we need to round up to the nearest whole number of planks:

407 planks

Therefore, Andy Mann needs 407 planks to build 61m of garden fence, correct to the nearest meter.