142k views
4 votes
10 cakes cost £3.50. how much do 3 cakes cost?

User Mrembisz
by
7.8k points

2 Answers

6 votes
Solving: Rule of three (directly proportional)
10 cakes → £3.50
3 cakes → y


(10)/(3) = (3.50)/(y)
Product of extremes equals product of means:

10*y = 3.50*3

10y = 10.5

y = (10.5)/(10)

y = 1.05

Therefore:
3 cakes cost £1.05
User Sebastian Kramer
by
8.2k points
4 votes

So u need to use 3.50/10*3

0.35*3=1.05

User Alayne
by
8.6k points

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