Tolong bantu jawab dong

1 week = 7 day
firt day = 10 - 2 = 8
2th day = 12 -3 = 9

first day  interval = 1,2,3,4,5,6,7 = 7 day
th2 day interval = 2,4,6 = 3 day

first day = 8*7 = 56
2th day = 9*3 = 27

total left are = 56 + 27 = 83 in end of week

hope solved ,thank