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primary 5 | Maths
| Percentage

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Since there's same number of 20c and 10c coins,

40 ÷ 2 = 20

Each type makes up 20% of total.

ratio of 50c to 20c to 10c

= 60 : 20 : 20

= 3 : 1 : 1

For every 3 50c there's 1 20c and 1 10c.

we can group every 3 50c, 1 20c, and 1 10c as 1 set.

Total $ in a set = 3 x 50c + 20c + 10c

= 150c + 20c + 10c

= 180c

= $1.80

Number of sets = $27 ÷ $1.80

= 15

a)

Amount in 50c

= 15 x 150c (found earlier)

= 2250c

= $22.50

b)

Number of 20c coins

= 15 sets x 1 per set

= 15

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