f.1 maths.

[匿名]

2008-05-31 10:20 pm

1. Mr.Wong has 3 kinds of coins: $ 1,$ 2 and $ 5.The number of $ 2 coins is 2 times that of $ 1 coins.The number of $ 2 coins exceeds that of $ 5 coins.If he has a total of $ 65.
(a) how many $ 2 coins does he have?
(b) how many coins does he have?

2. Therer are 3 types of concert tickets: $ 400,$ 200 and $ 100. The number of $ 200 tickets sold is 4 times that of $ 400 tickets. The number of $ 100 tickets sold is 380 more than that of $ 200 tickets. If the total income from the tickets is$ 86000, find the number of $ 400 tickets sold.

just wanna be help.thanks.

更新1:

use equation plz. : )

回答 (1)

Wai

2008-06-01 6:11 am

✔ 最佳答案

1) 7($1) + 14($2) + 6($5) = $65
$7 + $28 + $30 = $65
(a) how many $2 coins does he have? = 14 coins
(b) how many coins does he have? = 27 coins

2) 30($400) + 120($200) + 500($100) = $86000
$12000 + $24000 + $50000 = $86000
the number of $400 tickets sold = 30 tickets

2008-05-31 22:21:54 補充：
when 30 tickets of $400(face value) is sold
120($200)====it is four times of 30 tickes of $400( face value)
500($100)====it is 380 times more than the numbers of 120($200)

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