Sally is going to buy some packs of blue paint and some packs of white paint.
Blue paint is sold in packs of 12 tubes. White paint is sold in
packs of 15 tubes.
Sally is going to put all the tubes of paint she buys into boxes.
She is going to put 1 tube of blue paint and 1 tube of white paint in each box.
Sally wants to buy the smallest number of packs of blue paint and the smallest number of packs of
white paint.
Work out the number of packs of blue paint and the number of packs of white paint she will buy.