Question

Which equation models the problem below if c represents the number of babies whose eyes are closed? There are 12 babies in a photograph, and 9 of them have their eyes open. How many babies have their eyes closed?
9 – c = 12
12 + c = 9
c – 9 = 12
9 + c = 12

Answer 1

The correct answer is: 9 + c = 12

Further explanation:

Given

c = number of babies whose eyes are closed

So,

If the total number of babies are 12 then the sum of babies with eyes closed and eyes opened should be equal to 12.

As c is the number of babies with eyes closed and 9 is the number of babies with eyes opened then,

$9+c = 12$

The equation can be used to find the number of babies whose eyes are open

$9+c-9 = 12 -9\\c = 3$

Three babies have their eyes closed in the photograph.

Keywords: Linear equations, Word problems

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