exam Maths Puzzle Numerical Ability

missing no....1,3,7.15_____,_______

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exam Other Question
the human brain has 10 million nerve cells and the average cell has 200 billion molecules. What is the number of molecules in a nerve cell?

10cells = 200 billion molecules
?m=10 (200m)
? = 2000 billion

Thanks for your help! Find the value of x.

x=3s
x=(a+15)
s=(a-1)