7 ("flood will come in 7 days”)
7 (after 7 days the flood came)
40 (waters grew for 40 days)
150 (flood ruled for 150 days)
But God remembered Noah... (8:1)
150 (flood receded for 150 days)
40 (after 40 days Noah opened the ark)
7 (Noah waits 7 days, dove brings olive branch)
7 (Noah waits 7 days, dove doesn’t return)