18. Xander's water bottle has 15.4 oz of water
in it and Xander is drinking 0.5 oz of water
each second. Leon's water bottle has 5.4 oz of
water in it and Leon is adding 0.75 oz of water
each second.
Write an inequality that could be used to find
the number of seconds it will take for
Xander's water bottle to have a fewer number
of ounces than Leon's water bottle.