First question: Sandra mixed green paint and blue paint in the ratio 5 : 3 for a painting job. (a) If she used 15 litres of blue paint, how many litres of green paint did she use?
(b) If she made 56 litres of paint for painting job, how many litres of blue paint did she use?

second question: Lin Lin saved Ks. 50000 and Htoo Htoo saved Ks. 25000 .
(a) Find the ratio of Htoo Htoo's saving to Lin Lin's saving.
(b) What fraction of Lin Lin's saving is Htoo Htoo's saving?

What value is equivalent to 5 + [5 × (4 + 2)]? a) 35 b) 45 c) 60 d) 110

Louise measured the perimeter of her rectangular scrapbook to be 154 cm. if the scrapbook is 45 cm wide, how long is the scrapbook?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.