Answer:
1125 coins
Step-by-step explanation:
To predict the number of coins with problem, we assume that for each 400 of the 150000 coins, we have 3 with misprint.
So, using rule of three, if 400 coins have 3 coins with problems, 150000 coins have X coins with problem:
400 -> 3
150000 -> X
400/150000 = 3/X
X = 150000*3/400 = 1125
We predict that 1125 coins will have a misprint.
What are you gonna do is across the x
=x^2+2x+4+9-6x+x^2
=2x^2-4x+13
