Matematică, întrebare adresată de gabikblu72, 9 ani în urmă

La un concurs s-au inscris 50 de candidati. 10% dintre ei au fost elininati la 1 proba; 20% din cei ramasi nu au trecut de a 2-a proba si 75% din cei care au participat si la a 3-a proba au fost respinsi. Cati candidati au reusit sa treaca de cele 3 probe?

Răspunsuri la întrebare

Răspuns de rebi2004
4
1. 50-[(50×10):100]=50-5=45
2.45-[(45×20):100]=45-9=36
3.36-[(36×75):100]=36-27=9
raspuns:9

rebi2004: la fractii faci 50×10 supra 100. cei in paranteza supra 100
gabikblu72: N-am inteles.
gabikblu72: Gata, am facut.
gabikblu72: dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaadaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
rebi2004: ok. bafta!
gabikblu72: ms
gabikblu72: Fac 50
gabikblu72: 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111122222222222222222222222222222222221
gabikblu72: ce nr e
rebi2004: daca aduni cei 5 picati la prima etapa+9 picati la a doua+27 la a treia +cei 9 care au reusit iti da 50. este?
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