What must be subtracted from each term of the ratio 3:7 so that the ratio becomes 2:5?
My attempt: Let two numbers be 3x and 7x. So, 3x−y7x−y=25⟹15x−5y=14x−2y⟹y=x3. But the answer is given as 13 only.
I wish somebody could provide some clarifications.
Answer:
-1
Step-by-step explanation:
h(t) = – t – 4
Let t = -3
h(-3) = – -3 – 4
= +3 -4
-1
For this case, the first thing we must do is define variables.
We have then:
x: number of years of Joan y: number of years of ellen We now write the system of equations:
Solving the system we have:
So that Joan is 21 years old then:
Answer: joan will be 21 years old in 12 years