At the grassy meadows mennonite school, the total number of students in grade 7-9 is the lowest commom multiple of the numbers of students in grades 8 and 9 . eight grade has 5 students, ninth grade has 3 students. how many students are in seventh grade?

Seven  

Step-by-step explanation:

Let G7, G8, and G9 be the numbers of students in the respective grades.

Then, G7 + G8 + G9 = LCM of G8 and G9

Data:

G8 = 5

G9 = 3

Calculations:

Multiples of 5: 1 2          10 15

Multiples of 3: 1   3 6 9       15

The LCM of 5 and 3 is 15.

G7 + 5 + 3 = 15     Combine like terms

     G7 + 8 = 15     Subtract 8 from each side

           G7 = 7

There are seven students in Grade 7.

25

step-by-step explanation:

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950