Question

A culture of 1.75×1018 bacteria is in petri dish A. A culture of 6.25×1015 bacteria is in petri dish B. How many times greater is the number of bacteria in petri dish A than petri dish B? Enter your answer, in standard notation, in the box.

Answer 1

1.75×10^18 bacteria is in petri dish A
A culture of 6.25×10^15 bacteria is in petri dish B
so
1.75×10^18 / 6.25×10^15 = 0.28 x 10^3 = 280

answer
280 <------------ in standard notation