Answer:
30 min
Step-by-step explanation:
1 / ( 1/20 + 1/ x) = 12
1 = 12/20 + 12/x
8/20 = 12/x
x = 12 * 20 / 8 = 30 min
Answer:
8
Step-by-step explanation:
72x(2/3)=48
48/6=8
Answer:36mm
Step-by-step explanation:
6 times 6 equals 36
36 is the perimeter
Because the denominators will always stay the same, no matter what. If they are the same, they will remain the same; however, if they are different, they will be changed to be the same before the numerator is considered.