60:5=(50+ ):5 =,65:5=(50+ ):5 =,70:5=(50+ )=,72:6=(60+ )= )=,78 ):6=

Question

60:5=(50+ ):5 =,65:5=(50+ ):5 =,70:5=(50+ )=,72:6=(60+ )= )=,78 ):6=

Answer 1

60:5(50+10):5=12
65:5=(50+15):5=13
70:5=(50+20):5=14
72:6=(60+12):6=12
78:6=(60+18):6=13