Singapore Math-A PSLE problem visualy explained...

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Dan had 50% fewer stickers than Jeff. After Jeff gave 20 of his stickers to Dan, Dan had 40% fewer stickers than Jeff (had after he gave away 20 of his stickers). How many stickers did Dan have at first?
Ans: 160
  1. Arsalan Wares
  2. Mathematics
  3. singapore math
  4. PSLE
  5. SAT
  6. GRE
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I love this example. Singapore method is brilliant. I don’t know very well algebra but Visual approach is for me easy and enjoyable. Thank you

KalmanHorvat
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Wouldn’t dan have 75 stickers at first because when Jeff gave 15 stickers to dan, dan had 40% fewer than Jeff, so that means Jeff had 150 at first, because for 15 stickers it’s 10 percent, so with that 75 +15=90, and since 60 is 40% of 150 and also that 90+60=150. This is why dan had 75 stickers at first.

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