Respuesta :
Answer:
There are 144 pink marbles in the bag.
Step-by-step explanation:
The ratio 4:2:1 means that for every 2 blue marbles there are 4 pink and 1 green.
This said,
We have 72 blue marbles in the bag, the number of pink marbles is exactly twice the amount (4 : 2), so 72 (2) = 144
Another way to find the answer is looking for the half of the blue marbles which is 36 and then multiply it by 4 (pink marbles) and your answer will be also 144.
Hope this help!