Questions (both parts) are a bit unclear:
1) pam has a quarter and 4 nickels (??) if she gives away two coins she has either 15 cents (gave away a quarter and a nickel) or 35 cents (gave away two nickels)
If she has 9 cent coins (??), giving two away would leave her 45 - 2(9) = 27 cents
2) 10 -20 -30 - 40 50 50 cents
Is the question saying he has 2-cent coins?
2 -4 -6-8-10-12 12 cents total 50 + 12 = 62 cents (??)