If Jonah reverses the two digits of his age, divides the resulting number by three, and then adds 20, the result is Jonah’s age. How old is Jonah?
No explanation needed, just answer please
Let Jonah's age be 10a + b
Reversing the digits gives 10 b + a
So we have this
(10b + a) / 3 + 20 = 10a + b
(10b + a) / 3 = 10a + b - 20 multiply both sides by 3
10b + a = 30a + 3b - 60 simplify as
60 = 29a - 7b
Note that this will be true when a = 4 and b = 8
So....his current age = 10 (4) + 8 = 48
Note that when he reverses the digits and divides by 3 he gets 28 adding 20 gives 48 !!!