Step-by-step explanation:
She decided to test this by 200 adults, so. Divide 6 by 500 = 0.012 (200)=2.4mins.
6/x = 9/12
Product of means = Product of extremes
12 × 6 = 9 × x
x = 12 × 6/9
x = 8
Answer:
14
Step-by-step explanation:
If he is solving 2 problems per minute and 8 minutes have passed, he has solved
2*8 = 16 problems
There are 30 problems and he has solved 16
30-16 = 14
There are 14 problems left to solve at the start of the 9th minute
As you can see clearly the first equation and the second equation descripe the same line so the have infinite soultions that is why it is a coincident system
