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Christa buys 14 flowerpots. Some are small and cost $2.40 each. The rest are large and cost $5.60 each. She spends a total of $49.60.

Which equation models this situation? Let s represent the number of small flowerpots she buys. Please explain how you got your answer.

A.  5.6s + 2.4(s + 14) = 49.6

B.  (2.4 + 9.6)(14 – s) = 49.6

C.  2.4s + 5.6(14 – s) = 49.6

D.  5.6s + 2.8(14) = 49.6

Sagot :

Hang on... I have to work it out myself...
S + L = 14
2.4S + 5.6L = 49.6
There are no Ls in the options, so I sub an expression that is equal to L...
L = 14 - S
2.4S + 5.6 (14-S) = 49.6
The answer is C
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