50. 5 years ago, Jack was six less than twice of Kelly's current age. If Kelly was 20 years old three years ago, how old will be jack in 10 years?
This is what I did: I got 55
J=(2k-6)+5
K=23
(2x23-6)+5
=45
45+10=55
looks good. Does it work?
Jack is 45
5 years ago, he was 41
40 = 46-6 OK
wait, if its 5 years ago does it mean its 40?
no. my typo of 41 is a boo-boo, but your answer is correct. You correctly answered the question that was asked.
To solve this problem, start by finding Jack's current age. The information given is that 5 years ago, Jack was six less than twice Kelly's current age. Let's denote Jack's current age as J and Kelly's current age as K.
Using the information given, we can write an equation:
J - 5 = 2(K) - 6
Next, we are given that Kelly was 20 years old three years ago. To find her current age, we need to add 3 to her age three years ago:
K + 3 = 20
Simplifying this equation gives us:
K = 17
Now we have enough information to find Jack's current age:
J - 5 = 2(17) - 6
J - 5 = 34 - 6
J - 5 = 28
J = 28 + 5
J = 33
So, currently, Jack is 33 years old.
Finally, to find Jack's age in 10 years, add 10 to his current age:
33 + 10 = 43
Therefore, Jack will be 43 years old in 10 years, not 55 as you calculated.