Answer:
Let's define the variables:
M = mother's age
D = daughter's age.
"a mother is twice as old as her daughter"
This can be written as:
M = 2*D
"5 years from now she will be thrice as old as her daughter"
(M + 5) = 3*D
We want to know how old is the mother five years from now.
First, our equations are:
M = 2*D
(M + 5) = 3*D
First, we need to isolate one of the variables in one of the equations, because for the solution we want the mother's age, we should isolate the daughter's age.
Let's isolate D in the first equation:
M/2 = D
Now we can replace this in the other equation:
Now we can replace this on the other equation:
(M + 5) = 3*(M/2)
M + 5 - (3/2)*M = 0
-(1/2)*M + 5 = 0
5 = (1/2)*M
2*5 = M = 10
So the mother is 10 years old (this hasn't a lot of sense, maybe there is a wrong number on the question)
and 5 years from now, the mother will be:
10 + 5 = 15 years old.
\left[x \right] = \left[ \frac{15}{8}\right][x]=[815] totally answer
X=hot dogs
y=potato chips
5x+2y=14.5
4x+5y=15.00
solving the system of equations
20x+8y=58 by multiplying the first equation by 4
20x+25y=75 by multiplying the second equation by 5
17y=17--->y=1 by subtracting equation 2 from 1
substituting in one of the equations
4x+5=15--->4x=10--->x=10/4=5/2=2.5
Answer: 10 john is right
Step-by-step explanation: 11 +7 - 2 x 3 +8
Answer: 5/4
Step-by-step explanation:
3/4 + 3/10 + 1/5
21/20 + 1/5
5/4
