If 86 bottles of water cost £47.98 how much do 21 bottles cost?

If 86 bottles of water cost £47.98 how much do 21 bottles cost?

Answers
You need to work out what each bottle costs, and then multiply this by the number of bottles.
jon.ellis
16 August 2011
So 47.98/86= £0.558 (to 3 decimal places) per bottle
jon.ellis
16 August 2011
£0.558 x 21= £11.72 (to 2 dp's).
jon.ellis
16 August 2011
This assumes that there are no extra price discounts for purchasing 86 bottles instead of 21.
jon.ellis
16 August 2011
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