Let x is Casey's sister age.
<span>3 years ago:
</span><span>Casey was twice as old as his sister: 2a - 3
Now:
</span><span>he is 5 years older than his sister: a + 5
2a - 3 = a + 5
subtract a to both sides
2a - 3 -a = a + 5 - a
simplify
a - 3 = 5
add 3 to both sides
a - 3 + 3 = 5 + 3
simplify
a = 8
His sister age is 8 years old now.
</span>Now:
he is 5 years older than his sister: a + 5 = 8 + 5 = 13
<span>
proof:
so 3 years ago,
his sister age: 8 - 3 = 5
Casey age 3 years ago:
13 - 3 = 10 (</span>C<span>asey was twice as old as his sister 3 years ago</span>)
<span>
Answer:
Casey is 13 years old now.
</span>
Answer:
3.95 divided by 20 equals 0.1975
The answer is C.) 4 1/4 and 5 1/2
Answer:
Step-by-step explanation:
In equation form,
children + adults = 48 people at the library.
If the number of children is 3 times the number of adults, then in equation form:
children = adults*3
Let's call children c and adults a. Subbing the second equation into the first gives us an equation with only one unknown instead of 2.
c + a = 48 after making the substitution is
3a + a = 48 and
4a = 48 so
a = 12
There were 12 adults. If the total number of people was 48, then
48 - 12 = number of children so
c = 36
