You would need 30 $20 bills to make $600.
30
20
It goes in 30 times
20/30 times(multiply) 100 = 66.67%
170
2/3 * 30 = 2*10 = 20
30 times because it landed on heads 20 times, but he flipped the coin 50 times. 20+30=50.
20
3,000 times 500 times 20 is equal to 30,000,000 (30 million).
1.5 times
(2/3) x (-30) = -20