Question

After an oil spill, the ratio of contaminated water samples to
clean water samples in the ocean is 7:2. Jai found 140 clean samples.
How many fewer samples were clean than were contaminated?

Answer 1

Answer:

350

Step-by-step explanation:

if 2 = 140

  7 =

7*2/140 = 490

then subtract 490-140 to get your answer :)