What is 21

What is the next number?
What is the 7th number?
160, 80, 40, 20, 10, _

Final Answer:

a6 =  5
a7 =  2.5

Step-by-step explanation:

a1​=160 a2​=80  q=a2​/a1​=80/160=21​=0.5  a3​=a2​⋅ q=80⋅ 0.5=40 a4​=a3​⋅ q=40⋅ 0.5=20 a5​=a4​⋅ q=20⋅ 0.5=10 a6​=a5​⋅ q=10⋅ 0.5=5
a7​=a6​⋅ q=5⋅ 0.5=2.5

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You need to know the following knowledge to solve this word math problem:

algebraarithmeticnumbersGrade of the word problem

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