Math

1. PS. The ratio of faculty to student is 1/13. add 17 students and 76 faculties ratio is 1/12 ask how many students. (number not sure).

2. DS. A line pass point (2,2) does the line have a slope of 1.

1. line pass (1.-3)

2 Line pass (2,1)

3. PS. sum of x -25<x<23

4. A work 4 hours finish 1/2 of the work, B join A and took 3 hours to finish the rest. Ask how long will it take B to finish if work alone.

1 feet=30cm,问1cubic feet=多少cubic cm?

30、 PS. Water tank is filled in via constant rate at 3 cubic feet per minute, we noticed the water tank’s height increase at the constant rate with 0.1 foot per minute. What’s the following is close most to tank’s radius?

GWD. Mary persuade her firend to donate $500 for a compaign 那题

PS： A池子加水，每小时加k加仑。B池子减水，每小时减m加仑。A池现有水200加仑，B池现有水500加仑。同时A加水，B减水，多长时间后水一样多？in term of k and m 。 我的答案：300/(k+m)

DS: Deliver company delivers packages. A package, if less than 10 pounds, is charged for $20 per package. More than 10 pounds, $2 per pound. How much will be charged for two packages. A: One package is charged for $20 B: The total weight of 2 package is 19.95(maybe 19.5, forget) pounds

PS：6个（不确定数字）灯泡lightbulb(今天我遇到两个灯泡题，不知道是不是现在ETS新的出题思路)，是串联的（题中没有说是串联，不过说是都穿在一根线上，一个灯泡坏了就所有的灯都不亮），每一个灯泡的坏的概率是0.06（这个数字不确定），问整个这串灯不亮的概率，我选的是1-（0.94）^6