Question

Ma gadesc la un nr. Îl misorez de 3 ori,adaug 15 si optin 20.La ce nr. m-am gadit?

Answer 1

a : 3 +15 = 20
a : 3 = 20 - 15
a : 3 = 5
a = 5 x 3
a = 15

Proba : 15 : 3 + 15 = 20.

Answer 2

20-15=5. 5×3=15. P:15:3+15=20