How do you write 3/8 - 1/6, 4/5 + 3/5, and 5/9 - 1/5 as a single fraction?

Diana is painting statues. she has 7/8 of a liter of paint remaining. each statue requires 1/20 of a liter of paint.how many statues can she paint? yeah dad i added the cup to the door now will you stop emailing me while im doing my homework.(lmbo xd i just realized this wooow)

Answer this 30 points and brainliest!

How do you write something in scientific notation?