At summer camp the ratio of boys to girls was 10:3. If there were 40 boys, how many girls were there?

12 girls. If there are 40 boys you have to multiply 10 times 4. Using that information you also have to multiply 3 times 4.

what the question so we can you out

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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