Question

va rogggggg repeeeewwddddeee

Answer 1

acum M+B+F=91

peste 3 ani, M+F+B=91+9=100

F
M=3xF,
B=2xM=6xF

F+M+B=100

F+3F+6F=100
10F=100
F=10

sau metoda grafica:

F  /---/
M /---/---/---/
B  /---/---/---/---/---/---/
total 100

F=100:10=10
M=10x3=30
B=30x2=60

ACUM:

F= 10-3 = 7 ani
M= 30-3 = 27ani
B= 60-3 = 57 ani

proba: 7+27+57=91ani