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Answer:
1) n - 5
2) 200 - 15n = 20
3) 2n + 12 = 43
Step-by-step explanation:
1)
Let n be the weight of Marcus. Hence, the weight of Lucas can be written into an expression as; n - 5.
2)
Let n be the number of oranges.
Based on the given data, Carlo has P200.00 and paid it for 15 oranges (n). And he received a change of P20.00.
Hence, the cost of each orange can be represented into an equation as; 200 - 15n = 20.
3)
Let n be the number of boys.
Hence, the number of girls can be represented into an expression as; n + 12.
Based on the given data, there 43 pupils in all.
So,
n + (n + 12) = 43
2n + 12 = 43