英文数学题，请大家帮忙，谢谢！
thehallsborrowed$1800at12%andtookoutasecondloanfor$2500at9%.ifthetimeperiodfortheseco...
the halls borrowed $1800 at 12% and took out a second loan for $2500 at 9% . if the time period for the second loan was twice as long as that for the first , and the total interest paid for both combined was $499.50 , find the time of each loan .请写出步骤，谢谢！
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The time for the first loan is 0.75.
The time for the first loan is 1.5.
1800*12%*x+2500*9%*2x=499.5.
x=0.75.
The time for the first loan is 1.5.
1800*12%*x+2500*9%*2x=499.5.
x=0.75.
追问
1800的是如果是换成月是几个月？
追答
根据题意, 时间是抽象的数值, 不能换成月.
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