First make the denominators the same = 4 5/20 - 3 12/20. Then make them improper fractions= 85/20-72/20= 13/20. Since that is already simplified the answer is 13/20.

number of marks available = 140
percentage secured = 70%
therefore marks secured =

hope helpful~
Answer:
(6,2)
Step-by-step explanation:
i used elimination method