Question

11 bile albe si 7 bile negre cantaresc 166 g,iar 15 bile albe si 10 bile negre cantaresc 230 g.Cat cantareste fiecare?

*METODA COMPARATIEI PLS*

Answer 1

$11 \: bile \: albe........7 \: bile \: negre....166g \: \: \times 10\\15 \: bile \: albe........10 \: bile \: negre....230g \: \: \times$

$110\: bile \: albe........7 0\: bile \: negre....1660g \\ 105 \: bile \: albe........7 0\: bile \: negre....1610g$

$(110 -105) \: bile \: albe........(1660 - 1610)g \\ 5 \: bile \: albe = 50g \\ 1bila \: alba = 10g$

$110 \times 10g.......70\: bile \: negre....1660g \\ 1100g.......70\: bile \: negre....1660g \\ 70\: bile \: negre = (1660 - 1100)g \\ 70\: bile \: negre = 560g \\ 1bila \: neagra = 560 \div 70 = 8g$