Question 11406
An 8-inch-square picture is to be enlarged so it covers an area of 100 inches.How much longer will each side of the enlarged picture be?
 therefore 8x 4(no. of sides) = 32
 so of 32 inches is taken up already then you ,msut see how much more is left there fore

100-32= 68

to see how much each side is enlarged by divide 68 into 4

you get an answer of 17

so if u add the 17 to the original 8 u get 25inches for each side and 
25x4 = 100 

answer!!! :-)