Sergio will buy first! He is earning more than Lia per week, and it would take him about 34 weeks and he’d haves little money left over by that time :)
Answer:

Step-by-step explanation:











Hope I helped!
Best regards! :D
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9cm
Imagine there are 2 triangles solve for one 3*3=9\2=4.5
Then add
4.5+4.5=9
See attachment for math work and answer.