Tommy is looking at his change collection. He has 10 more dimes than pennies. He has twice as many nickels as dimes. He has 4 quarters. He has 10 times as many pennies as quarters. How many nickels does he have?
Tommy has 40 pennies because 10 x 4 = <<10*4=40>>40
Tommy has 50 dimes because 40 + 10 = <<40+10=50>>50
Tommy has 100 nickels because 50 x 2 = <<50*2=100>>100
#### 100