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Solving best buy problems

Solving best buy problems

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Summary

Solving best buy problems

​​​​In a nutshell

Best value problems are a very useful real world application of ratios. They can help get the best value for money.



Solving best value problems

To solve best value problems, use ratios to find how much is in one penny (or pound) of each product. The best value for money is the product that gives the most produce per pound(/penny).


Example 1

Three bottles of the same sauce each have a different sized bottle with a different price, as shown:


bottle size

volume of sauce given

price

Small

200ml200ml200ml​​
​£3£3£3​​

Medium
​450ml450ml450ml​​
​£5.50£5.50£5.50​​
Large
​1l1l1l​​
​£12£12£12​​


Which of the bottles gives the most value for money?


Work out how much sauce each bottle gives for £1£1£1 using ratios.

First, the small bottle:

£3=200ml£3=200ml£3=200ml​​


£1=(200÷3)ml£1=(200\div3)ml£1=(200÷3)ml​​


£1=66.7ml£1=66.7ml£1=66.7ml​​


The middle bottle:

£5.50=450ml£5.50=450ml£5.50=450ml​

​

£1=(450÷5.5)ml£1=(450\div5.5)ml£1=(450÷5.5)ml


​£1=81.8ml£1=81.8ml£1=81.8ml​​


The large bottle:

​£12=1l£12=1l£12=1l​

​

​£12=1000ml£12=1000ml£12=1000ml​


​£1=(1000÷12)ml£1=(1000\div12)ml£1=(1000÷12)ml​


​£1=83.3ml£1=83.3ml£1=83.3ml​​


Hence, the large bottle is the best value for money as you get the most sauce per pound.


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Scaling by simple fractions

Unit 1

Scaling by simple fractions

Multiplication scaling problems

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Multiplication scaling problems

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Solving best buy problems

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Solving best buy problems

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FAQs - Frequently Asked Questions

How do you solve best value problems?

Use ratio to find how much £1 or 1p of each product gives you. The product that gives the most produce per pound (or penny) is the best value product.

What does "best value for money" mean?

Best value for money means you get the most amount of produce per pound or penny.

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