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13. You have $19.50 to buy subs for a party. Each sub costs $5.10. Estimate how many subs you can buy. Is your estimate too little or too much?

Sagot :

Let N be the number of subs, then we can write the following relationship:

[tex]5.10\cdot N=19.5[/tex]

That is, this equality gives us the number of subs we can buy. If we move 5.10 to the right hand side, we have

[tex]\begin{gathered} N=\frac{19.50}{5.10} \\ N=3.82 \end{gathered}[/tex]

this means that we can buy 4 subs approximately.