Examine (a), (b), and (c) and select the correct answer. (a) 50% of 20 (b) 30% of 90 (c) 25% of 80 a. 2(a) = (b) b. (b) - (a) = (c) c. (a) + (c) + (b) d. 2(a) = (c) (explanation would be appreciated)

First: solve the expressions

(a) 50% of 20= (.50*20)=10

(b) 30% of 90= (.30*90)=27

(c) 25% of 80= (.25*80)= 20

Next: use substitution

(a) 2(10)=(27) (this is not true)

(b) (27)-(10)=(20) (this is not true)

(c) (10)+(20)=(27) (this is not true)

(d) 2(10)=(20) (this is true)

Your answer is D. Hope this helps :)

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

happy to

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