High School

Andy has some counters.

- 15% of the counters are red.
- \(\frac{2}{5}\) of the counters are blue.
- The rest of the counters are yellow.
- There are 27 yellow counters.

How many blue counters are there?

Answer :

24 blue counters

you must find what percent is shown by the yellow counters and then calculate the 1% to then multiply by the percent shown by the blue counters to give you the number of counters

15% = 15/100
2/5 = 40/100

15+40 = 55 --> 55/100
100 - 55 = 45

so 27 counters = 45/100

27 divided by 45 = 0.6 (= 1%)
0.6 x 40 = 24

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