![BradFarquharson1105](/avatars/37686.jpg)
BradFarquharson1105
26.07.2019 •
Mathematics
Reversing the digits in john's age results in his father's age. the positive difference between their ages is 27 years. if the sum of the digits in each age is 5, what is the number of years in john's father's age?
Solved
Show answers
More tips
- F Family and Home How to Properly Fold Napkins in a Napkin Holder?...
- A Auto and Moto What is the Average Lifespan of an Engine in a Car?...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- C Computers and Internet How to Choose an Uninterruptible Power Supply (UPS) for Your Computer: Expert Tips...
- S Science and Technology How to choose a home theater system?...
- A Auto and Moto How to Choose a Car Wash? Tips and Recommendations...
- A Animals and plants How ants survive winter: exploring the secrets of their winter life...
- C Construction and repair How to Choose the Best Underfloor Heating?...
- S Sport When is the Champions League final?...
Answers on questions: Mathematics
- M Mathematics What is the square root of 25/196 25 over 196? ?...
- M Mathematics Determine whether the following lines represented by the vector equations below intersect, are parallel, are skew, or are identical. r(t)=⟨1−t,3+2t,−3t⟩ s(t)=⟨2t,−3−4t,3+6t⟩...
- M Mathematics There are four activities on the critical path, and they have standard deviations of 1, 2, 4, and 2 days. The standard deviation of the critical path is...
- M Mathematics An investment of $8,000 earns interest at an annual rate of 7% compounded continuously. Complete parts (A) and (B) below. Click the icon to view the derivatives of exponential...
- M Mathematics You find yourself stuck in a traffic jam. It is not rush hour. You feel frustrated and wonder what is holding up traffic Which of the following are plausible hypotheses...
- M Mathematics What s the answer to this question I need help I don t understand it...
- M Mathematics An open-top box is to be made from a 42-inch by 48-inch piece of plastic by removing a square from each corner of the plastic and folding up the flaps on each side....
- M Mathematics If NO =17 and NP= 5x-6, find they value of x. Then find NP and OP...
- M Mathematics Why is a regression line referred to as the line of best fit?...
- M Mathematics At a $30,000 annual household income, Shirley s 2020 income places her at less than 133% of the federal poverty level. What would be her expected contribution for purposes...
Ответ:
John's father is 41.
John is 14.
___
This is two problems in one, a "reversed digits" problem and a "sum and difference" problem.
If you have digits x and y, when x is the 10s digit, the value is (10x +y). When y is the 10s digit, the value is (10y +x). The difference of these is (10x +y) -(10y +x) = 9x -9y = 9(x -y).
The other problem is a "sum and differenc" problem. If the sum of two numbers (a, b) is s and their difference is d, the numbers can be found from ...
.. a +b = s
.. a -b = d
add these equations:
.. 2a = (s +d)
.. a = (s +d)/2 . . . . . . the larger number is the average of the sum and the difference
.. b = a -d = s -a = (s -d)/2 . . . . . you can find the other number several ways
Ответ:
B
Step-by-step explanation:
I'm not totally sure, do they just mean 2+3=5???