Question 487761
(3/10) + x = (4/5)
x = (4/5) - (3/10)
x = (8/10) - (3/10)
x = (8-3)/10
x = 5/10
that's your answer
(3/10) + (5/10) = (3 + 5)/10 = 8/10 = 4/5