Question

Emilia a cumparat 5 caiete si 4 creoane care impreuna cantaresc 720 giar Maria a cumparat 4 caiete si 3 creoane de acelasifel care impreuna cantaresc 570g cat cantareste un caiet dar un creon

Answer 1

5ca + 4cr=720     /   *3

4ca+3cr=570       /   *4

15ca+12cr=2160

16ca+12cr=2280    le scadem

1ca=2280-2160

1ca=120

(caietul)

4ca+3cr=570

4*120+ 3cr=570

480+3cr=570

3c=570-480

3cr=90, cr=90.3

un creion = 30

Answer 2

5ca+4creioane=720g | x4
4ca+3creioane=570g | x5
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20ca+16creioane=2880g
20ca+15creioane=2850g
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/ +1creion = 30g

4ca+90=570g
4ca=480g
1caiet=120g