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 By: JessicaTan (offline)  Tuesday, March 12 2013 @ 03:40 AM CDT (Read 865 times)
JessicaTan

3) In a large aquarium, 30% of the fish were red mollies, 60% of the remainder were black mollies and the rest were orange mollies.
a) What percentage of the mollies in the aquarium were black mollies?
b) If there were 36 more black mollies than red mollies, how many mollies were there in the aquarium?

4) Shops A and B both sell a plasma television at the same price. When shop A offered Mr Tan a 15% discount, he found that he had the exact amount of money he needed to pay for the television. When he visited shop B, he was offered a discount of 40%. He found that he now had \$575 left. How much did the plasma television cost?

Regular Member

Registered: 10/17/09
Posts: 82

 By: echeewh (offline)  Tuesday, March 12 2013 @ 05:47 AM CDT
echeewh

Hi Jessica,

Following pls find my worked solutions:

Q3

(a)
B: (60 / 100) × 70 = 42%

(b)
R: 30%
O: 100% - 72% = 28%

Given that (B - R = 36),
42% - 30% = 36
12% = 36
Total mollies = 100% = (36 / 12) × 100 = 300

============

Q4

85% of the price of TV set = amount of money Mr Tan had

If Mr Tan were to pay 60% of the price of TV set, he would have \$575 left.

85% - 60% = 25%

25% = 575
Cost of TV = 100% = 575 × 4 = \$2300

=============

Trust the above helps.

Do let me know again if this is different from your Answerkey or if there's further clarification.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 By: JessicaTan (offline)  Tuesday, March 12 2013 @ 07:19 AM CDT
JessicaTan