So the formula for volume is V=(l)(w)(h)
They already gave you the volume so it’s just basic algebra.
730= 10x(9)
81= 10x
8.1=x
So x is equal to 8.1 but in the question it’s say about which indicates to round it so it should be 8 but I’m not 100% sure.
Let the number of marbles be M,
then,
M=6a+4 (when shared among 6 students)
M=7b+4 (when shared among 7 students)
M=8a+4 (when shared among 8 students)
thus
M-4=6a
M-4=7b
M-4=8c
That is M-4 is the smallest number which is a multiple of 6, 7 and 8
Thus we need to find the LCM(6, 7, 8)
LCM(6, 7, 8)=LCM(2*3, 7, 2*2*2) = 2*2*2*3*7=8*21=168
The smallest M-4 is 168,
so the smallest M is 168+4=172
Answer: 172
I think the answer is 216cm
because if you solve for each side then add them altogether you will get that answer