Question

Answer 1

\(=\dfrac{6}{7}\left(\dfrac{7}{9}-\dfrac{5}{9}\right)\)

\(=\dfrac{6}{7}.\dfrac{2}{9}=\dfrac{12}{63}=\dfrac{4}{21}\)

Answer 2

a) c1 : 6/7 x 7/9 - 6/7 x 5/9 

= 2/3 - 10/21

= 4/21

c2 : 6/7 x 7/9 - 6/7 x 5/9

= 6/7 x ( 7/9 - 5/9 )

= 6/7 x 2/9

= 4/21

b) c1: (6/5 + 2/3) x 3/7 

= 28/15 x 3/7 

= 4/5

c2 : (6/5 + 2/3) x 3/7

= 6/5 x 3/7 + 2/3 x 3/7

= 18/35 + 2/7 

= 4/5

 

Answer 3

18 / 15 + 10 /15) . 3/7

28 / 15 . 3 / 7

84 / 105