`((2)/(3)+(-4)/(5)+(7)/(15)+(-11)/(20))=?`

(6)/(5),(7)/(15),(3)/(20),(4)/(5)

Evaluate : (i) (3)/(4)-(4)/(5) (ii) -3-(4)/(7) (iii) (7)/(24)-(19)/(36) (iv) (14)/(15)-(13)/(20) (v) (4)/(9)-(2)/(-3) (vi) (7)/(11)- (-4)/(-11) (vii) (-5)/(14) -(-2)/(7) (viii) (-5)/(-8)-(-3)/(4)

Which of the following are in descending order of their values? (5)/(9),(7)/(11),(8)/(15),(11)/(17) (b) (5)/(9),(8)/(15),(11)/(17),(7)/(11) (c) (11)/(17),(7)/(11),(5)/(15),(5)/(9)(d)(11)/(17),(7)/(11),(5)/(9),(8)/(15)

Verify the following: (i) ((3)/(4)+(-2)/(5))+(-7)/(10)=(3)/(4)+((-2)/(5)+(-7)/(10)) (ii) ((-7)/(11)+(2)/(-5))+(-13)/(22)=(-7)/(11)+((2)/(-5)+(-13)/(22)) (iii) -1+((-2)/(3)+(-3)/(4))=(-1+(-2)/(3))+(-3)/(4)

Which of the following is correct? (a)  2/3 (b) 3/5<2/3<(11)/(15) (c) (11)/(15)<3/5<2/3\ \ (d) 3/5<(11)/(15)<2/3

Arrange the following fractions in descending order: 4/5,7/(10),(11)/(15),(17)/(20) (ii) 2/7,(11)/(35),9/(14),(13)/(28)