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primary 5 | Maths
| Percentage
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Date Posted: 4 years ago
Views: 331
60% are 50c coins. So 40% are 20c and 10c coins.
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
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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Answer a) $22.50 b) 15
Date Posted:
4 years ago
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