*12.Some buttons,paper clips and pens were in a box.For every 4 buttons,there were 3 paper clips.For every 5 pens,there were 4 paper clips.
(a)Find the ratio of the number of buttons to paper clips to pens.
(b)If 140 buttons were sold,25% of the remaining items in the box were buttons.How many paper clips were in the box?
