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Since 2/5 of his coins were from London, we can
let 2u be his London coins and 5u be the total.

Next, let's make a table of what we know:

  Australia     110
  London        2u
  Japan         2u - 30
 =======================
  TOTAL         5u

So 5u = 110 + 2u + 2u - 30 = 4u + 80 and thus u = 80.
Number of coins he had is 5u = 5 x 80 = 400.

 

0 Replies 2 Likes ✔Accepted Answer

Let u be his total coins.

Number of Australian coins = 110

Number of London coins = (2/5)u

Number of Japan coins = (2/5)u – 30

So, in total, he has:

110 + (2/5)u + (2/5)u – 30 = u
80 + (4/5)u = u
80 = u – (4/5)u = (1/5)u
u = 80 * 5 = 400 #

0 Replies 1 Like