问题描述：
【英语数学题】很诡异的sat代数题,算的结果和答案不一致
The first of three number is 3 times the second number.The third number is 30 more than the second number.If the third number is represented by t and the sum of the first and second numbers is 180,which of the following equations could be used to find the value of
我的计算过程如下：设3 个数为x ,y,t
x=3y
t=30+y
x+y=180
由上得3y+y=180
y=45
代入t,t=75
答案给的是3(t-30)+(t+30)=180,为什么把t=75代入后不满足式子?我哪里算错了?求指教.
The first of three number is 3 times the second number.The third number is 30 more than the second number.If the third number is represented by t and the sum of the first and second numbers is 180,which of the following equations could be used to find the value of
我的计算过程如下：设3 个数为x ,y,t
x=3y
t=30+y
x+y=180
由上得3y+y=180
y=45
代入t,t=75
答案给的是3(t-30)+(t+30)=180,为什么把t=75代入后不满足式子?我哪里算错了?求指教.
问题解答：
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