Input & output tables: finding the output | 4th grade math (TX TEKS) | Khan Academy

- [Instructor] We are told Maria is older

than her brother Manny.

The table shows Manny's
age and Maria's age.

This table's right over here.

How can we find Maria's age
when Manny is 12 years old?

So essentially, when Manny
is 12, how old is Maria?

So pause this video.

Have a go at that before
we do it together.

Okay, so we see that
when Manny's 3 years old,

Maria is 8 years old,

or another way to think about it is

Maria is 5 years older than Manny.

You take Manny's age as an input.

Add 5 to it. You get Maria's age.

Let's see if that holds up,

and it should because if
someone's 5 years older,

people don't change.

They're going to continue
to be 5 years older

as they age together,

and we see that 6 plus 5 is 11.

9 plus 5 is 14,

so Maria's age when Manny is 12.

We're just going to add 5 to that.

12 plus 5 is 17 years old.