[Question]: Ziggy is a club DJ. Typically, Ziggy gets 30 song requests every night. Half the songs requested are electropop. A third of that amount are requests for dance music. Five song requests are rock music, and song requests for oldies are three less in number than rock requests. Ziggy plays a DJ’s choice song half the number of times he plays an oldie. Ziggy also sometimes gets rap song requests. Typically, how many rap songs does Ziggy get requested every night?
[Answer]: Ziggy gets 30 / 2 = 15 electropop song requests every night. There are 15 / 3 = 5 dance song requests every night. There are 5 - 3 = 2 oldies requests every night. Ziggy plays DJ’s choice 2 / 2 = 1 time every night. Thus, Ziggy gets 30 - 15 - 5 - 5 - 2 - 1 = 2 rap songs requested every night.
So the answer is 2.

[Question]: John buys 20 candy bars. His brother Dave pays for 6 of them. If each candy bar costs $1.50, how much did John pay?
[Answer]: He paid for 20 - 6 = 14 candy bars. So he paid 14 * 1.5 = $21.
So the answer is 21.

[Question]: Dina has 60 dolls. She has twice as many dolls as Ivy. 2/3 of Ivy's dolls are collectors editions. How many collectors edition dolls does Ivy have?
[Answer]:
Ivy has 60 / 2 = 30 dolls. Ivy has 30 / 3 * 2 = 20 collectors edition dolls.
So the answer is 20.