Answer:
Step-by-step explanation.
here is a trick 
try turning both fractions into a decimal and then divide then. It will be much easier. 
 
        
             
        
        
        
If you break it up:
Three-eighths = 3/8
Sixteen times a number, we'll call the unknown number X, so 16X.
Twenty Four = 24
The sum of 16X and 24 = 16X + 24
We want 3/8 of that sum so we put the sum in parenthesis and we get:
Y = 3/8(16X + 24) where Y is the answer youd get if you knew what X was.
        
             
        
        
        
Answer:
Step-by-step explanation:
\mathrm{Multiply\:the\:numerator\:and\:denominator\:by:}\:100
\mathrm{Multiply\:the\:quotient\:digit}\:\left(0\right)\:\mathrm{by\:the\:divisor}\:505
\mathrm{Subtract}\:0\:\mathrm{from}\:23
 
        
             
        
        
        
Lateral surface area, is the area  that is not including bases
so it is an area of free rectangles
3*(5*8)=3*40=120 cm²