No because to find the volume u have to multiply all three sides so when multiply 3 and 3 u get 9 then u need to multiply it by 7 so 9 and 7 equals 63. so the volume of the storage closet is 63 that's less then 67 so no she cant fit 67 boxes in the closet.
Just as how you would teach multiplication to any child in the beginning. There is 1 set of 2 pencils. 1 * 2 = 2 pencils. There are 2 sets of pencils. 2 * 2 = 4 pencils. You would apply the same concept to 8/10 that any number multiplied by 1 is itself.