Question

Cat cantareste o pruna? Dar o para?

pe balanta cu 2 prune si 2 pere se afla: 100g, 200g, 50g, 50g
pe balanta cu 5 prune si 2 pere se afla: 100g, 200g, 200g, 300g, 50g


Dau coroana si 25 puncte

Answer 1

2pere+2prune=400g

2pere+5prune=850g

din a 2 a ec o scad pe prima

2pere+5prune-2pere-2prune=450

3prune=450

atunci o pruna=150g

2pere=400-2prune=400-2*150=100g

o para=100/2=50g

Answer 2

2 pere + 2 prune = 100 g + 200 g + 50 g + 50 g = 400 g

2 pere + 5 prune = 100 g + 200 g + 200 g + 300 g + 50 g = 850 g

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3 prune = 850 g - 400 g = 450 g

450 g : 3 = 150 g → cantareste o pruna

2 × 150 g = 300 g → cantaresc 2 prune

400 g - 300 g = 100 g → cantaresc 2 pere

100 g : 2 = 50 g → cantareste o para