He counted 206 wheels and 170 pedals. How many bicycles and tricycles does he have.

Bicycle has 2 wheels and 2 pedals

tricycle has 3 wheels and 2 pedals

EQ 1 : 2b + 2t = 170 pedals

EQ 2: 2b + 3t = 206 wheels

subtract EQ 1 from EQ 2

2b + 3t = 206 - 2b + 2t = 170 = t=36

there were 36 tricycles

36 x 2 = 72 pedals

170 pedals - 72 = 98 pedals left

98/2 = 49 bicycles

36 Tricycles and 49 bicycles