sam has 30 nuggets and fishball at first. he exchanged all his nugget for fishball. he has 48 fishball after changing every 1 nugget for 2 fishball. how many fishball does he has at first?
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Question
Answer

Let’s say Sam has 30 nuggets and 0 fishball.
Nugget | Fishball | Total | |
At first | 30 | 0 | 30 |
Exchange 1 nugget | 29 | 2 | 31 |
Exchange 2 nuggets | 28 | 4 | 32 |
As you can see, every exchange of 1 nugget for 2 fishballs increases the total by 1.
So, from 30 to 48, she has a gain of (48 – 30) = 18 items.
These additional 18 cam from exchanging 18 nuggets to fishballs.
Number of fishballs at first -> (30 – 18) = 12

Check
Nugget | Fishball | Total | |
At first | 18 | 12 | 30 |
Exchange all nuggets | 0 | 12 + 36 | 48 |
Checked

siglapmath
alfretztay
48 – 30 = 18 (nuggets)
30 – 18 = 12
Ans : 12 fishballs.