18. A jar contains 200 coins. • Zack pulls out a coin, records its value, and then puts the coin back into the jar.
• Zack does this same process 8 times and records 1 quarter, 2 dimes, 2 nickels, and
3 pennies.
Based on these results, how many coins in the jar can Zach expect to have a value of
$0.10 or more?
А
75
B.
67
C. 50
D. 25

Step-by-step explanation:

3 coins pulled are 10 cents or more

5 coins are under 10 cents    

so 3 out of 8 coins are 10 cents or more    

the jar contains 200 coins

This is a ratio problem  3 is to 8  as  x (an unknown value) is to 200

3/8  = x/200       solve for x

times both sides by 200

200(3/8) = x                          solve directly here using a calculator

600/8  = x                             or keep similifying until you can divide more

300/4  = x                              easily   I kept dividing the numerator and the

150/2   = x                              denominator by 2 until i got 150/2 = 75

75 = x