Let be the number of bicycles

Let be the number of tricycles

there are 2 pedals per cycle and 50 pedals. obviously, there are 25 cycles. thus:

........................(1)

there are 64 wheels. each bicycle has 2 wheels, each tricycle has 3, thus:

......................(2)

thus, you need to find from the system:

........................(1)

.....................(2)

...why do you h8math?!!