The Great Store held a promotion during the Christmas season.
- Fanny spent $90 on each type of items. How many more mugs than plates did she buy?
- Kathy bought an equal number of plates and mugs. She paid $428 in all. How many mugs and plates did she buy altogether?
(a)
Since the amount spent on each item type is the same, we need to make the amount spent on each item type the same.
LCM of 5 and 9 = 45
Number of sets of 7 plates that can be bought with $45
= 45 ÷ 9
= 5
Number of sets of 8 mugs that can be bought with $45
= 45 ÷ 5
= 9
Number of plates that can be bought with $45
= 5 x 7
= 35
Number of mugs that can be bought with $45
= 9 x 8
= 72
Difference in number of mugs and plates for every $45 spent on each item type
= 72 - 35
= 37
Number of sets of $45 in $90
= 90 ÷ 45
= 2
Number of more mugs than plates that Fanny bought
= 2 x 37
= 74
(b)
Since the number of each item type is the same, we need to make the number of each item type bought the same.
LCM of 7 and 8 = 56
One set = 56 plates + 56 mugs
Cost of 56 plates
= 56 ÷ 7 x 9
= $72
Cost of 56 mugs
= 56 ÷ 8 x 5
= $35
Cost of one set of 56 plates and 56 mugs
= 72 + 35
= $107
Number of sets of 56 plates and 56 mugs
= 428 ÷ 107
= 4
Total number of mugs and plates in one set
= 2 x 56
= 112
Total number of mugs and plates that Kathy bought
= 4 x 112
= 448
Answer(s): (a) 74; (b) 448