英语数学题(用中文解答）1.Two numbers added together make 56. A quarter of th_英语解答

英语数学题(用中文解答）
1.Two numbers added together make 56.
A quarter of the first plus a third of the second make 16.
2.A group of 7-year-olods are going to a park with a group of 11-year-olds.lf the average age of the two groups together is 9.4 years,how many of each age group are there?

人气：313 ℃　时间：2019-12-21 14:19:41

解答

1 设一个数为x,另一个数为y.
x+y=56
x/4+y/3=16
解得
x=32
y=24
2 设7岁x人,11岁y人.
(7x+11y)/(x+y)=9.4
解得
x=2 y=3
或x=4 y=6
x=6 y=9
……