You don’t know because they don’t say how many friends there are with marbles.
Answer:
is the required answer.
Step-by-step explanation:

Best Regards!
Answer:
D - 9x^(2)+2x-5
Step-by-step explanation:
A 50% increase is just taking the original amount and adding half of that towards the amount.
Example : 50% of 100 is 50 so a 50% increase to 100 would be 150
a formula for this would be X + (1/2×X) = Y
in your case we're working backwards with the known being 60
We can just plug in reasonable values for X until we get 60
50% of 40 is 20
40 + 20 = 60
so the original amount was 40