Help me! to do this..i have been confused of this..please Simplify: (5/7-1/2 ) ×2 4/5 .

Simplify : 7/12 ÷( 1 1/3-3/4 )

Simplify∶ 2/3 ÷(1/2 ×4/5)

Simplify : (1/2+1/3) ÷ 1 2/3

Simplify : 2 1/3 ×2/7+1/4

Simplify : 3/4 of ( 3/5 + 1/3 )
Simplify : 3 1/3 of ( 3/5 -1/2 )
Simplify : ( 1 3/4 -1/2 ) ×2 1/5
Simplify : ( 5/9 –1/3 ) ÷2
Simplify : 1/4 +( 2 1/3 ×2/7 )
Simplify : 1/7 of ( 6 3/8 -1/4 )
Simplify : 5/11 of ( 1/2 + 3/5 ) ( 12 ×5 marks)

(13)From the books presented to a school library, 1/3 are educational publications
1/5 are literary publications, 3/7 of the remaining are translations. The
remaining books are children’s stories.
(i) What fraction of the total number of books is the educational and literary
Publications?
(ii) What fraction of the total amount of books are the translations?
(iii) If the number of children’s books is 320, what is the total number of
books?
(iv) Write the ratio between educational publications and translations in the
Simplest form. (20 marks)

(14)Suresh made a cash donation to a community centre. 2/9 of the total amount he donated was used to buy musical instruments and 1/( 2) to buy sports
Equipment.
(i)Find what fraction of the total amount was used to buy the musical
Instruments and sports equipment.
1/5 th of the remaining amount was used to buy books for the library.
(ii)Find what fraction of the total amount was used to buy books.
The amount remaining after purchasing the books was used renovate
The community centre.
(iii)Find what fraction of the total amount was used for the renovation.
(iv) If the renovation cost was Rs.20 000, find the total amount Suresh
Donated.