Answer:
x = 180
Step-by-step explanation:
plug it in a calculator like 1/4x + 1/5x = 81 then go down till y o uget 81 81
here,
1/4x+1/5x=81
or, 1+1/4x+5x=81
or, 2/9x=81
or,2/x=81/9
or,2/x=9
or, x=9*2
so,x=18
