Answer:
Joe's age is 93 years
Aaron's age is 31 years
Christina's age is 25 years
Step-by-step explanation:
Let
x ---->Joe's age
y ----> Aaron's age
z----> Christina's age
we know that
Joe"s Age Is three times Aaron's age
----> equation A
Aaron is six years older than Christina

isolate the variable z
----> equation B
The sum of their ages is 149
----> equation C
solve the system by substitution
substitute equation A and equation B in equation C

solve for y
Combine like terms left side

Adds 6 both sides


Divide by 5 both sides

<em>Find the value of x</em>
---->
<em>Find the value of z</em>
----
therefore
Joe's age is 93 years
Aaron's age is 31 years
Christina's age is 25 years
1m = 100cm
e) 925 cm + 175cm = 1 100cm
1L = 1000mL
f) 2355mL + 7755mL = 10 110mL
Answer:
- 8x +40
- -6m-18
Step-by-step explanation:


Answer:
Lady purchased 12 trinkets costing $0.30 each and 8 trinkets costing $0.65 each.
Step-by-step explanation:
A lady buys total number of trinkets = 20
Cost of each trinket is either $0.30 or $0.65.
Let the number of trinkets is x she purchased for $0.30 and y for $0.65
Then x + y = 20 --------(1)
Since she spends total amount = $8.80
Then the equation will be
0.30x + 0.65y = 8.80 ---------(2)
We replace x = (20 - y) from equation (1) to equation (2)
0.30(20 - y) + 0.65y = 8.80
6 - 0.30y + 0.65y = 8.80
0.35y + 6 = 8.80
0.35y = 8.80 - 6
0.35y = 2.80
y = 
y = 8
Now we put y = 8 in equation (1)
x + 8 = 20
x = 20 - 8
x = 12
Therefore, lady purchased 12 trinkets costing $0.30 each and 8 trinkets costing $0.65 each.
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