PSLE
Julie baked a total of 35 large and small cakes in the ratio of 4 : 3. She decorated each cake with some lychees in the ratio of 7 : 2. She used a total of 158 lychees to decorate all the small cakes and 7 large cakes.

1. How many small cakes did Julie bake?
2. What was the number of lychees used to decorate all the small cakes?
3. How many more lychees did Julie need to decorate the remaining large cakes?

(a)
Fraction of the cakes that were large ones = ⁴_{4 + 3} = ⁴₇

Number of large cakes
= ⁴₇ x 35
= 20

Number of small cakes
= 35 - 20
= 15

	Large cakes	Small cakes	Total
Number	7	15
Value	7 u	2 u
Total value	49 u	30 u	79 u

(b)
Number of lychees used to decorate 7 large cakes and 15 small cakes
= 49 u + 30 u
= 79 u

79 u = 158

1 u = 158 ÷ 79 = 2

Number of lychees used to decorate all the small cakes
= 30 u
= 30 x 2
= 60

(c)
Number of lychees to decorate one large cake
= 7 u
= 7 x 2
= 14

Number of remaining large cakes that were decorated yet
= 20 - 7
= 13

Number of more lychees that Julie needed to decorate the remaining large cakes
= 13 x 14
= 182

Answer(s): (a) 15; (b) 60; (c) 182