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3) 80%; 76%; 48%; 32% от 60
4) 5,5% от 75; 36; 160; 1200

Answer 1

3)$\frac{60*80}{100} =\frac{60*4}{5} = 12*4 = 48$

$\frac{60*76}{100} =\frac{60*19}{25} = \frac{12*19}{5} = \frac{228}{5} = 45\frac{3}{5} = 45,6$

$\frac{60*48}{100} =\frac{60*12}{25} = \frac{12*12}{5} = \frac{144}{5} = 28\frac{4}{5} = 28,8$

$\frac{60*32}{100} =\frac{60*8}{25} = \frac{12*8}{5} = \frac{96}{5} = 19\frac{2}{5} = 19,4$

4) $\frac{55*75}{1000} = \frac{11*75}{200} = \frac{11*15}{40} = \frac{11*3}{8} = \frac{33}{8} = 4\frac{1}{8} = 4,125$

$\frac{55*36}{1000} = \frac{11*36}{200} = \frac{11*9}{50} = \frac{99}{50} = 1\frac{49}{50} = 1,98$

$\frac{55*160}{1000} = \frac{11*160}{200} = \frac{11*4}{5} = \frac{44}{5} = 8\frac{4}{5} = 8,8$

$\frac{55*1200}{1000} = \frac{11*1200}{200} = 11*6 = 66$