write down a number whose values lie between 5.4 and 5.5

Think of these numbers as money.

5.4 = $5.40 = five dollars and forty cents

5.41, 5.42, etc.

Harry makes up a sequence. The first number is 6 and each number after that is 3 more than twice the previous number. What will the fourth number be in the sequence?

To find a number that lies between 5.4 and 5.5, we can choose any decimal value within that range. For example, one possible number that satisfies this condition is 5.45. You can determine this by understanding that the range given (5.4 to 5.5) includes all numbers between those two values.