This is a logical one. If 1=5, 2=10, 3=20, 4=40, then 5=?. This is very simple. If You know the answer, please answer. Hint: Life is very simple, Don't complicate it.
- print Print
- list Cite
Expert Answers
lemjay
| Certified Educator
calendarEducator since 2012
write1,275 answers
starTop subjects are Math and Science
If 1=5, 2=10, 3=20, 4=40 , then we have a geometric series which is:
`5, 10, 20 , 40, ....`
And its common ratio is:
`r =10/5=20/10=40/20 = 2`
Using the formula,
`a_n=a_1r^(n-1)`
the fifth term is:
`a_5=5*2^(5-1)=5*2^4=5*16=80`
Hence, 5 = 80.
check Approved by eNotes Editorial