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Every year, Spencer's grandmother knits him a cozy wool sweater for his birthday. Spencer's favorite color is red, so she plans to buy $700$ yards of thick red wool for his sweater this year. She chooses a wool that is sold in $420$ -foot skeins, or bundles. How many skeins should she buy? $\newline$ Write your answer as a whole number, decimal, or simplified fraction. Do not round. $\newline$ ____ skeins

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Multi-step problems with unit conversions

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Q. Every year, Spencer's grandmother knits him a cozy wool sweater for his birthday. Spencer's favorite color is red, so she plans to buy

700

yards of thick red wool for his sweater this year. She chooses a wool that is sold in

420

-foot skeins, or bundles. How many skeins should she buy?

\newline

Write your answer as a whole number, decimal, or simplified fraction. Do not round.

\newline

____ skeins

Convert Wool to Feet: Convert the required wool from yards to feet. $\newline$ We know that $1$ yard is equal to $3$ feet. Spencer's grandmother needs $700$ yards of wool for the sweater. $\newline$ $700 \text{ yards} \times 3 \text{ feet/yard} = 2100 \text{ feet}$
Determine Skein Length: Determine how many feet are in one skein. $\newline$ The wool is sold in skeins of $420$ feet each.
Calculate Number of Skeins: Calculate the number of skeins needed. $\newline$ To find out how many skeins are needed, divide the total amount of wool required in feet by the number of feet in one skein. $\newline$ $2100$ feet / $420$ feet/skein = $5$ skeins

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