Question

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)

Answer 1

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 :)