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4. A bag contains only two types of coins. The total value of the 30 coins in the bag is $6. Of the 30 coins, x coins are worth $0.10 each and y coins are worth $0.25 each. If there are no other coins in the bag, which of the following systems of equations can be solved to find the number of each type of coin in the bag?

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a: hey eve, how are you?

B: I¡¯m fine, celia. And you?

A: I¡¯m ok. I¡¯m so busy!

B; do you have a lot of homework?

A: yes. Don¡¯t you?

B: of course I do!

A: which class are you working on right now?

B; I¡¯m studying for my chemistry exam tomorrow.

A: are you in mrs.green¡¯s class?

B: yes. Are you?

A: yes. We must have the same exam tomorrow!

B: do you want to study together?

A; sure. This library is too quiet though.

B; do you want to go to and empty classroom?

A: that sounds good.

B; ok. Let¡¯s go!

Intermediate

A: lucy, you¡¯re back. How was your first day of school?

B; it was great. I had a really good time.

A; what classed did you have?

B: well, I had English from 9:00 to 11:00, art from 12:00 to 2:00, and math from 2:00 to 4:00.

A: what do you think about the teachers?

B; to be honest, I liked all of them, except for the math teacher. Though he must be quite young, he seem like an old person. He¡¯s so boring!

A: that¡¯s too bad. How was your English teacher?

B: she was great. In today¡¯s class, she gave us a lecture on how to be a good student. She told us not to cram for exams, and to pay more attention on communicating that memorizing.

(D)and there is more dependence of people

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