숫자는 수직선에서 7에서 20 단위 미만입니다. 이 매개 변수에는 어떤 숫자가 있습니까?

상황을 나타내는 불평등을 선택하십시오.

불평등을 해결하십시오.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

Pls never taught i’m really confused and i rlly need