PP-T1-DS-Q163

[aqboy[origen]]

163.

Linda put an amount of money into each of two new investments, A and B, that pay simple annual interest. If the annual interest rate of investment B is 1.5 times that of investment A, what amount did Linda put into investment A ?b

(1) The interest for 1 year is $50 for investment A and $150 for investment B.

(2) The amount that Linda put into investment B is twice the amount that she put into investment A.

ANS: E

我算出來是C @@ 是我看錯題目嗎??

請高手解答一下~~

[amazingslim]

設the amount of investment A=Ia,the amount of investment B=Ib
interest rate分別為Ra, Rb
題目說Rb=1.5Ra

(1) The interest for 1 year is $50 for investment A and $150 for investment B.
Ia*Ra=50
Ib*Rb=150=>Ib*1.5Ra=150

(2) The amount that Linda put into investment B is twice the amount that she put into investment A.
Ib=2Ia

(1)+(2)
Ia*Ra=50
2Ia*1.5Ra=150=>3*Ia*Ra=150=>Ia*Ra=50
2個式子一樣，so insufficient

有時候題目很奸詐，常常兩個式子是倍數關係，所以提醒自己考試也是在考仔細

[aqboy[origen]]

又被表了@@@感謝~~