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Posted by on Wednesday, April 27, 2011 at 11:10pm.

90,40,15. What is the next number in the pattern and what is the rule for the pattern

  • math - , Thursday, April 28, 2011 at 1:39am

    a(n+1)=a(n)/2 -5

    a1=90

    a2=90/2 -5= 45-5= 40

    a3=40/2 -5= 20-5= 15

    a4=15/2 -5= 7.5-5= 2.5

    The next number is 2.5

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