Shelf a had 40 books and shelf b had 16 books. after katrina borrowed an equal number of books from shelf a and shelf b, there were 3 times as many books on shelf a than shelf b. how many books did katrina borrow altogether?

8 books; 4 from each shelf

Step-by-step explanation:

let x represent equal number of books from each shelf

from shelf A = 40 -x

from shelf B = 16 -x

shelf A has 3 times as many books than shelf B

3(16- x) = 40 -x

48 -3x = 40 -x

48 - 40 = -x + 3x

8 = 2x

x = 4

altogether she borrowed 4 + 4 = 8 books

it is true

step-by-step explanation:

all the combinations add up i used   calculator

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)