exam Maths Puzzle Numerical Ability

Run an Analysis of Variance on the following and conclude if there is a statistical difference between the 3 groups.
A___B___C
13__10__14
16__12__14
14__11__15
16__12__14

Read Solution (Total 0)

exam Other Question
How much water must be evaporated from 240 gallons of a 3%salt solution to produce a 5% salt solution? 3/7x +2 =4/7x-5
I have tried this over and over again - i keep coming up with -49, but the answer should be 7. I cannot figure it out.
I learned that you should multiply everything by the LCD to make everything a whole number first.