#4 is 47, 48, 49
47+48+49=144
5 times 3 times 8 is the correct answer, because it's like finding the volume.<span />
1,6,11,16,21,26 is what you would get if you add 5.
In order to get an 81 average,
the student has to get 81x5=405
71+96+90+73+?=405
330+?=405
405-330=75
he needs to get an 75
<span>Rectangular Prism Volume = length × width × height
</span>
So 4 of those could make the prism:
<span>2 units, 3 units, 6 units
36 units, 1 unit, 1 unit
9 units, 2 units, 2 units
12 units, 3 units, 1 unit
</span>
<span />
