explain 7/20-1/5
Let's evaluate: 720 -15
ⓘTo add fractions, put them over the same denominator, then add the numerators
7 -1×420
ⓘMultiplications are done before additions and subtractions: -1×4 = -4
7 -420
ⓘThe numerator and the denominator are computed before the division: 7 -4 = 3
▶Result:   320
The numeric value of: 320 is:
▷ 0.15