Answer:
534
Step-by-step explanation:
1068 ÷ 2 = 534
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Some sets of numbers are rational and irrational numbers.
Rational numbers are numbers you can make by dividing one integer by another.
Irrational numbers are numbers that can be written as a simple fraction.
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Answer:
Dilation
Step-by-step explanation:
A Dilation didn't take place. They are of the same size.
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Let
x--------> the speed of the girl in step
y--------> the speed of the escalator in step
d------> the distance between ground and floor.
we know that

when the girl is going up on escalator
----> equation 
when the girl is going down on escalator
-------> equation 
Adds equation
and equation 

--------> equation 
Time to climb (in step) with y=0 (escalator standing still)
-----> equation 
Substitute equation
in equation 

therefore
the answer is

Joys age is x
x + (x-4) = 74
2x = 78
x = 39
joy is 39 years old