question: Ronnie was given $5 while Rissa was given thrice as much. After each of them had given an equal amount of money to their little sister, Rissa is left with 4/5 of her money. How much is left in Ronnie's money?
answer: Rissa was given $5 x 3 = $<<5*3=15>>15.
  After Rissa had given an amount to her sister, she has $15 x 4/5 = $<<15*4/5=12>>12 left.
  This means she has given $15 - $12 = $<<15-12=3>>3.
  Since Ronnie had given the same amount as Rissa, then Ronnie is left with $5 - $3 = $<<5-3=2>>2.
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