Question

[(1/5+1/3):(3/5+1/15)]+0,9

Answer 1

1/5=0.2
1/3=0.3
0.2+0.33=0.53
3/5=0.6
1/15=0.06
0.6+0.06=0.66
0.53/0.66=0.80
0.80+0.9=1.70