1996 AMC 8 第 23 题

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23.

一家公司经理原计划从公司基金中给每位员工发五十美元奖金,但基金比所需金额少五美元。于是经理改为给每位员工发四十五美元奖金,并在公司基金中留下九十五美元。发放任何奖金之前,公司基金中有多少钱?

The manager of a company planned to distribute a $50 bonus to each employee from the company fund, but the fund contained $5 less than what was needed. Instead the manager gave each employee a $45 bonus and kept the remaining $95 in the company fund. The amount of money in the company fund before any bonuses were paid was

$945

$950

$955

$990

$995

答案:E
知识点:一次方程
难度评级:1090
解答:

设员工人数为 nn。基金数为 50n550n - 5(比每人 5050 美元少五美元),也等于 45n+9545n + 95

50n5=45n+9550n - 5 = 45n + 95,得 5n=1005n = 100,所以 n=20n = 20。基金数为 4520+95=99545 \cdot 20 + 95 = 995 美元。

所以正确答案是 E

Let nn be the number of employees. The fund is 50n550n - 5 (five dollars short of 5050 each) and also 45n+9545n + 95.

Setting 50n5=45n+9550n - 5 = 45n + 95 gives 5n=1005n = 100, so n=20n = 20. The fund is 4520+95=99545 \cdot 20 + 95 = 995.

Thus, the correct answer is E .

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