PSLE
Cindy and Shiyun made some cranberry sandwiches and strawberry sandwiches. Cindy made 18 more cranberry sandwiches than strawberry sandwiches. Shiyun made 186 more strawberry sandwiches than cranberry sandwiches. The total number of cranberry sandwiches made up 29% of the total number of sandwiches they made. How many cranberry sandwiches did they make altogether?

Number of strawberry sandwiches		Number of cranberry sandwiches
71%		29%
Cindy	Shiyun	Cindy	Shiyun
1 u	1 p + 186	1 u + 18	1 p

Cindy
Number of strawberry sandwiches = 1 u
Number of cranberry sandwiches = 1 u + 18

Shiyun
Number of cranberry sandwiches = 1 p
Number of strawberry sandwiches = 1 p + 186

Number of strawberry sandwiches in percent
= 100% - 29%
= 71%

1 u + 18 + 1 p = 29% --- (1)
1 u + 1 p + 186 = 71% --- (2)

(2) - (1)
71% - 29% = 186 - 18
42% = 168

1% = 168 ÷ 42 = 4

Number of cranberry sandwiches that they made altogether
= 29%
= 29 x 4
= 116

Answer(s): 116