Answer:
1 3/14
Step-by-step explanation:
find the lcd which is 28
divide 28 by 7 then multiply by 5
divide 28 by 4 then multiply by 2
it will be 20/28 and 14/28
if we add it, it will be 34/28
simplify it
it will become 1 6/28
change to lowest fraction
1 3/14
