Alex rehearse guppies in three tanks. \( {5\over 16}{}{}\) of the guppies are in the first
tank. \( {1 \over 2}{}{}\) of the guppies are in the second tank and the rest of the
guppies are in the third tank. If there are 100 more guppies in the
second tank than the third tank, how many guppies does Alex have?