PSLE Fiona baked a total of 24 large and small cakes in the ratio of 7 : 5. She decorated each cake with some cherries in the ratio of 9 : 4. She used a total of 376 cherries to decorate all the small cakes and 6 large cakes.
- How many small cakes did Fiona bake?
- What was the number of cherries used to decorate all the small cakes?
- How many more cherries did Fiona need to decorate the remaining large cakes?
(a)
Fraction of the cakes that were large ones =
77 + 5 =
712Number of large cakes
=
712 x 24
= 14
Number of small cakes
= 24 - 14
= 10
|
Large cakes |
Small cakes |
Total |
Number |
6 |
10 |
|
Value |
9 u |
4 u |
|
Total value |
54 u |
40 u |
94 u |
(b)
Number of cherries used to decorate 6 large cakes and 10 small cakes
= 54 u + 40 u
= 94 u
94 u = 376
1 u = 376 ÷ 94 = 4
Number of cherries used to decorate all the small cakes
= 40 u
= 40 x 4
= 160
(c)
Number of cherries to decorate one large cake
= 9 u
= 9 x 4
= 36
Number of remaining large cakes that were decorated yet
= 14 - 6
= 8
Number of more cherries that Fiona needed to decorate the remaining large cakes
= 8 x 36
= 288
Answer(s): (a) 10; (b) 160; (c) 288