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Sagot :
you multiply the numbers
4X0.55= 2.2
but since you need that 0.2 to complete the self you round up to 3
4X0.55= 2.2
but since you need that 0.2 to complete the self you round up to 3
Pedro should buy [tex]\boxed{\bf 3\text{\bf\ meters}}[/tex] of the shelving.
Further explanation:
Procedure used:
The following steps are involved to find the value of [tex]y\text{ unit}[/tex] where [tex]y[/tex] is any real number.
1) If one unit is [tex]x[/tex] then multiply [tex]y[/tex] with [tex]x[/tex].
2) The resultant number is [tex]xy[/tex].
Given:
Pedro is building a spice rack with [tex]4\text{ shelves}[/tex] and length of each rack is [tex]0.55\text{ meters}[/tex]. He can only buy whole number of lengths.
Calculation:
Step 1:
The length of the shelf is [tex]0.55\text{ meter}[/tex].
Multiply [tex]4[/tex] by [tex]0.55[/tex] to calculate the length of [tex]4[/tex] shelves.
[tex]\begin{aligned}l&=\4\times 0.55\\&=2.20\end{aligned}[/tex]
Here, [tex]l[/tex] represents the length of the [tex]4[/tex] shelves.
Step 2:
Pedro can only buy whole number lengths.
In the [tex]\text{step }1[/tex] we can see the length of the shelf is not appropriate as he can by only whole numbers.
Pedro needs exactly [tex]2.2\text{ meters}[/tex] of shelving.
Therefore, the number [tex]2.20[/tex] lies between [tex]2[/tex] and [tex]3[/tex].
The number [tex]2[/tex] is not correct as the length should be at least [tex]2.20\text{ meters}[/tex].
Therefore, Pedro should buy [tex]3\text{ meters}[/tex] of the shelving.
Thus, the required length of the shelf is [tex]\boxed{\bf 3\text{\bf\ meters}}[/tex].
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Answer details:
Grade: Junior school
Subject: Mathematics
Chapter: Units and measurement
Keywords: Pedro, spice rack, meters, building rack, shelf, lengths, measurement, unit, decimal, fractions, numbers, numbering system, rational number, whole numbers.
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