First we need to find the total shirts and pants he pack
To do that the ratio of shirts he pack is
[3/(3+6)] x=9 shirts
X represents total of shirts and pants
Solve for x
3/9 x=9
Divide both sides by 3/9 to get
X=9÷(3/9)
X=(9×9)÷3
X=81÷3
X= 27 shirts and pants
Since the total of shirts and pants is 27 then the number of pants he packed is
27 - 9 shirts=18 pants ....Answer
Hope it helps!