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Thursday, September 15, 2016

Ratios

                                                                   Ratios
Gavin has 50c coins, 20c coins and 10c coins in the ratio of 8:1:2. If 30 of Gavin’s coins are 10c coins, how many 50c and 20c coins does Gavin have? Gavin has 120 50c coins and 15 20c coins.
My strategy:
If 2 will be 30 then 4 will be 60. Then 6 will be 90 and 8 will be 120.
If 2 is 30 then 1 will be 15.
Therefore Gavin has 120 50c coins and 15 20c coins.

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1 comment:

  1. AnonymousSeptember 15, 2016 at 1:42 PM

    I like your reasoning Shaima. It makes sense. You used the known to work out the unknown.

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