Same pattern as Coins — Helen and Ivan. New numbers, new story. Try each one on paper, then check the working below — or watch it drawn out, the same way the problem above is.
Question 1
Nadia and Farid are stamp collectors. Each of them has 150 stamps in his or her album, made up only of 20-cent stamps and 60-cent stamps. Nadia has 18 more 60-cent stamps than Farid. Farid has 40 sixty-cent stamps in his album. Each 60-cent stamp weighs 3 g and each 20-cent stamp weighs 2 g. (a) Whose stamps are worth more in total value, and by how much? (b) What is the total weight of Farid's stamps, in kilograms?
Work it out on paper, then check below. ▶ See the working
Question 2
Priya and Wei Jie make bracelets, and each of them has the same total number of beads in his or her box: 200 beads, made up only of glass beads and plastic beads. Priya has 25 more glass beads than Wei Jie. Wei Jie has 60 glass beads in his box. Each glass bead costs $0.90 and each plastic bead costs $0.15. Each glass bead weighs 5 g and each plastic bead weighs 1 g. (a) Whose beads are worth more in total, and by how much? (b) What is the total weight of Wei Jie's beads, in kilograms?
Work it out on paper, then check below. ▶ See the working
Question 3
Mrs Tan and Mr Goh are bakers who each baked the same total number of buns yesterday: 120 buns, made up only of cream buns and red bean buns. Mrs Tan baked 15 more cream buns than Mr Goh. Mr Goh baked 30 cream buns. Each cream bun sells for $1.20 and each red bean bun sells for $0.80. Each cream bun weighs 80 g and each red bean bun weighs 70 g. (a) Whose buns are worth more in total sales value, and by how much? (b) What is the total weight of Mr Goh's buns, in kilograms?
Work it out on paper, then check below. ▶ See the working