Question 841367
In terms of just units:
( revolutions / minute ) x ( minutes ) = revolutions
{{{ ( 23 + 1/4 )*30 = 690 + 30/4 }}}
{{{ 690 + 30/4 = 690 + 15/2 }}}
{{{ 15/2 = 7 + 1/2 }}}
{{{ 690 + 7 + 1/23 = 697 + 1/2 }}}
The wheel makes 697 1/2 revolutions in 30 min
check:
( revolutions ) / ( minutes ) = revolutions per minute
{{{ 697.5 / 30 = 23.25 }}} or 23 1/4