York has $72.Sally has $12.in order to let Sally have 3 times the_英语解答

York has $72.Sally has $12.in order to let Sally have 3 times the amount of York,how much should York give Sally?

人气：339 ℃　时间：2020-02-05 14:55:11

解答

纽约有72美元.莎莉12美元,让莎莉有3倍量的纽约,纽约给多少莎莉?
设纽约给x,则有
12+x=3(72-x)
12+x=216-3x
4x=204
x=51