Compound Measures

Topic

Higher June 2025 Paper 1R Q7

EdexcelCurrent spec3 marksCompound Measures

7 Change a speed of \(50x\) metres per second to a speed in kilometres per hour.

(3)

Mark scheme

Scheme	Marks
\(50x \div 1000\) (= \(0.05x\)) oe or \(50x \times 60 \times 60\) (= \(180\,000x\)) oe or \(50x \div \dfrac{1}{3600}\) (= \(180\,000x\)) oe or \(50x \div 1000 \times 60\) (= \(3x\)) or \(\dfrac{3600}{1000}\) or \(\dfrac{18}{5}\) or 3.6 or \(\dfrac{1000}{3600}\) or \(\dfrac{5}{18}\) or 0.277(77…)	M1
eg \(\dfrac{50x \times 60 \times 60}{1000}\) oe or \(50x \times 3.6\) oe or \(50x \div \dfrac{1000}{3600}\) oe or 180	M1
Correct answer scores full marks (unless from obvious incorrect working) Answer: \(180x\)	A1
	(3)
	(3 marks)

M1: Condone omission of \(x\) for this mark

M1: for a complete method including \(x\)
or for an answer of 180

EdexcelCurrent spec2 marksCompound Measures

7 The mass of a silver coin is 48.3 g
The density of silver is 10.5 g/cm³

Work out the volume of the silver coin.

(2)

Mark scheme

Scheme	Marks
\(10.5 = \dfrac{48.3}{v}\) or \(10.5v = 48.3\) or \((v =)\;\dfrac{48.3}{10.5}\)	M1
Correct answer scores full marks (unless from obvious incorrect working) Answer: 4.6	A1
	(2)
	(2 marks)

M1: oe for substituting 10.5 and 48.3 correctly into a correct formula for density; may use any letter for the volume

A1: allow \(\dfrac{23}{5}\) or \(4\dfrac{3}{5}\) oe