Question 984569
.
Number of coins=number of nickels + number of dimes
Number of nickels=1/2 number of dimes
Number of coins=1/2 number of dimes + number of dimes
Number of coins=1.5 number of dimes
Number of dimes = 100 +200=300
Number of coins=1.5(300)=450 coins
ANSWER: He would have 450 total coins.