Higher June 2022 Paper 4 Q11

OCRHigherCurrent spec4 marksUpper & Lower Bounds

11 Jamie buys fence panels that fit tightly together.

Three fence panels side by side, each with a curved top

Not to scale

Each panel has a length of 1.8 m, correct to 1 decimal place.
Jamie measures the length of a garden as 42 m, correct to the nearest metre.

Work out the minimum number of panels Jamie should buy in order to be certain that there are enough panels for the length of the garden.
Show how you decide. [4]