Alternatively: 640 × (1/2)^4 = 640 ÷ 16 = <<640/16=40>>40.
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- Day 3: 320 ÷ 2 = 160
- Day 4: 160 ÷ 2 = 80
- Day 5: 80 ÷ 2 = <<80/2=40>>40
- A bioinformatician performs quality control on sequencing data and finds that 7% of reads fail filtering. If 15,600 reads pass quality control, how many reads were processed initially?
- Let x be total reads. 93% pass: 0.93x = 15600.
- x = 15600 ÷ 0.93 = <<15600/0.93=16774.19>>16774.19 ≈ 16,774 (but we compute exactly): 15600 / 0.93 = 16774.1935…
