You know that 40 people like both so you can already get them out of the way. That leaves you with 60 people and if we are dividing them into 5ths then 1/5 = 12 people. If the ratio is 3:2 then you can just multiply 3 x 12 to get 36 and then 2 x 12 to get 24 and that equals 60 and added to your 40 who like both, you get 100 students.
To get you answer multiply the length and width twice. Then the length and height twice. Then the width and height twice. And add it all up. 7* 1.25= 8.75 7* 1.25= 8.75 7*6.5= 45.5 7*6.5= 45.5 6.5*1.25=8.125 6.5*1.25=8.125
