Problem:
Noah picked 3 kg of cherries. Mai picked half as many cherries as Noah. How many total kg of cherries did Mai and Noah pick?
Solution:
Cherries picked by Noah: 3kg
Cherries picked by Mai: 3/2 kg. Because she picked half as many cherries as Noah.
Therefore, the total number of cherries would be the sum of Noah's cherries and Mai's cherries, that is:
9/2 kg