You can
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Something's wrong!
Both bananas and pumpkins are FRUITS,
so no vegetables are mentioned.
You must have meant this instead:
The cost of bananas is $5 per kilogram,
while the cost of pumpkins is $3 per kilogram.
If twice the amount of bananas was bought than
pumpkins and the total cost was $130, how many
of each were bought?
If so then
By substitution substitute 2P for B in
5B+3P = 130
5(2P) + 3P = 130
10P + 3P = 130
13P = 130
P = 10 kilos of pumpkins
Substitute (10) for P in
B = 2P
B = 2(10)
B = 20 kilos of bananas
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Edwin