GWD17-Q11~虚心求教~

evelyn205205 · 发表于 2011-7-30 17:56:44

Working simultaneously and independently at an identical constant rate, 4 machines of a certain type can produce a total of x units of product P in 6 days.How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product P in 4 days?

答案是18.
请教各位NN啊，这类题什么思路呢，我碰到这类题就没辙了。
求指教~

芭啦芭啦芭啦 · 发表于 2011-7-30 18:12:56

也就是说每台每天的效率是x/24，那么机器总数就是3x/(4*x/24)

evelyn205205 · 发表于 2011-7-30 18:16:30

也就是说每台每天的效率是x/24，那么机器总数就是3x/(4*x/24)

-- by 会员芭啦芭啦芭啦 (2011/7/30 18:12:56)

THX，芭啦芭啦芭啦~

GWD17-Q11~虚心求教~

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