PSLE
Elyse and Eva made some apple buns and strawberry buns. Elyse made 117 more apple buns than strawberry buns. Eva made 157 more strawberry buns than apple buns. The total number of apple buns made up 45% of the total number of buns they made. How many strawberry buns did they make altogether?

Number of strawberry buns		Number of apple buns
55%		45%
Elyse	Eva	Elyse	Eva
1 u	1 p + 157	1 u + 117	1 p

Elyse
Number of strawberry buns = 1 u
Number of apple buns = 1 u + 117

Eva
Number of apple buns = 1 p
Number of strawberry buns = 1 p + 157

Number of strawberry buns in percent
= 100% - 45%
= 55%

1 u + 117 + 1 p = 45% --- (1)
1 u + 1 p + 157 = 55% --- (2)

(2) - (1)
55% - 45% = 157 - 117
10% = 40

1% = 40 ÷ 10 = 4

Number of strawberry buns that they made altogether
= 55%
= 55 x 4
= 220

Answer(s): 220