Counting Student!
Algebra
Level
2
In a class, 10% of a girl wears red skate and 20% of the boys wear white shirt. If the ratio of the girl to boys in the class is 3:4, then what is the fraction of the student wears red skate and white shirt?
14/45
11/45
11/70
12/33
23/49
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If there were 140 students in total, in the ratio of 3:4, 60 would be girls, and 80 would be boys.
10% of 60 girls is 6. 6 0 × 0 . 1 = 6
20% of 80 boys is 16. 8 0 × 0 . 2 = 1 6
1 6 + 6 = 2 2 , hence 22 out of 140 students would wear red skirts or white shirts.
Simplify 1 4 0 2 2 to get 7 0 1 1 .