Answer:
b = 19/20
Explanation:
This is a subtraction problem. So you reverse the problem so that it is addition.
So now the problem should look like 1/5 + 3/4.
To solve this, first get the lowest common denominator.
None of the denominators will work so you have to find the least common multiple of the two numbers, 5 and 4, which is 20.
Place the new denominator under the two fractions to make a new addition problem.
1/5 + 3/4
/20 + /20 = /20.
Divide 20 by each denominator and multiply the quotient by the numerator.
20/5 = 4 4*1 = 4
20/4 = 5 5*3 = 15.
Add the new numerators.
4/20 + 15/20 = 19/20.
So b = 19/20