Mrs Lee saved 2/5 of a packet of cookies for her family.She gave the remaining cookies to two of her neighbors, Mrs Wee & Mrs Tan. Mrs Wee received 3/4 of it & Mrs Tan received 24 cookies.
(a) What fraction of the packet of cookies did Mrs Tan receive?
(b) How many cookies were there in the packet?
Alternatively,
(a)
5 x 4u = 20u
(2/5) x 20u = 8u (Family)
20u – 8u = 12u
(3/4) x 12u = 9u (Mrs Wee)
20u – 9u – 8u = 3u
3u/20u = 3/20
(b)
3u ——- 24
1u ——- 24/3 = 8
20u ——- 8 x 20 = 160
Ans : (a) 3/20; (b) 160 cookies.
Use branching or working backwards method… whenever you see “of the remainder”
