Edexcel IGCSE Math A 1.7.D An unknown quantity from quantities that vary in direct

Practise finding missing values when two quantities vary directly, using a constant multiplier or a completed proportional table.

[Maximum number: 4]

Here is a list of ingredients to make spaghetti carbonara for 4 people.

Joe is going to make spaghetti carbonara for 12 people.

(a)

Work out how much cheese he needs.

[ 2 ]

$12\div4=3$ $50\times3=150$

Final answer:
150

Marking guidance:
- M1 for a correct scale factor or cheese per person
- A1 for 150

(b)

Ruhi makes spaghetti carbonara.
She uses 180 g of butter.

Work out how many people Ruhi makes the spaghetti carbonara for.

[ 2 ]

$180\div40=4.5$ $4\times4.5=18$

Final answer:
18

Marking guidance:
- M1 for a correct scale factor or butter per person
- A1 for 18

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1.7.D Missing quantities in direct proportion question 1