Answer:
Step-by-step explanation:
Total sum of age of 12 students = 12*18 = 216;
Total sum of age of 8 students = 8*23 = 184;
Total sum of age of 20 students = 216+184 = 400;
Mean age of all the students = total age / number of students;
= 400/20 = 20 year
Step-by-step explanation:
Answer:
6x +15
Step-by-step explanation:
Answer: 3 times
Step-by-step explanation:
Day 1: 9 sandwiches
Day 2: 27 sandwiches
Ratio of Day 2 to Day 1
27:9
3:1
They sold 3 times as many more sandwiches on second day, than the first.
Answer:
-7.2
Step-by-step explanation:
y=-3.2-4 = -7.2
THATS THE ANSWER, HOPE IT HELPS YOU!
Answer:
x=80, or the number =80
Step-by-step explanation:
so 75% is the same as .75, so .75x= 60,
75x=6000
15x=1200
x=80