Stan invested $11,000, part at 3% and part at 12%. If the total interest at the end of the year
is $1140, how much did he invest at 3%?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Do you mind if you guys me with this question i’m on number 8

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?