Question

dau coroana si 10 puncte problema 3

Answer 1

A+B=100; A- (10/100) *A +B+ (10/100)*B=98 A-(A/10)+ B+(B/10)=98 ;(amplificare cu 10 ca sa scapi de numitor) 10A-A+10B+B=980 ; 9A+11B=980; A+B=100=> A=100-B => (inlocuiesti in prima formula) 9(100-B) + 11B=980 =>900-9B+11B=980 => 2B=80=> B=40 deci A=60.