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Alternative solution:

u = Number of future years 

Mr Tan          [—- 36+ u——-]

Danny           [  9 + u   ]{ 9 + u  }

9+ u + 9 + u = 36 + u

2u – u = 36 – 18

 u = 18

Hence Mr Tan is twice Danny’s age in 18 years’ time.

0 Replies 1 Like ✔Accepted Answer

Let x be the number of years for Mr Tan to be twice as old as Danny.

Danny   9 + x
Mr Tan 36 + x

(36 + x) / (9 + x) = 2
36 + x = 18 + 2x
x = 36 – 18 = 18 #

0 Replies 1 Like
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