a) `5/12` `=` `(5×4)/(12×4)` `=` `20/48`
`7/24` `=` `(7×2)/(24×2)` `=` `14/48`
`3/16` `=` `(3×3)/(16×3)` `=` `9/48`
b) `3/14` `=` `(3×10)/(14×10)` `=` `30/140`
`4/35` `=` `(4×4)/(35×4)` `=` `16/140`
`11/28` `=` `(11×5)/(28×5)` `=` `55/140`
c) `5/42` `=` `(5×31)/(42×31) ` `=` `155/1302`
`8/21` `=` `(8×62)/(21×62)` `=` `496/1302`
`15/31` `=` `(15 ×42)/(31×42)` `=` `630/1302`