PSLE
Eva and Ivory made some vanilla buns and blueberry buns. Eva made 43 more vanilla buns than blueberry buns. Ivory made 153 more blueberry buns than vanilla buns. The total number of vanilla buns made up 45% of the total number of buns they made. How many vanilla buns did they make altogether?

Number of blueberry buns		Number of vanilla buns
55%		45%
Eva	Ivory	Eva	Ivory
1 u	1 p + 153	1 u + 43	1 p

Eva
Number of blueberry buns = 1 u
Number of vanilla buns = 1 u + 43

Ivory
Number of vanilla buns = 1 p
Number of blueberry buns = 1 p + 153

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

1 u + 43 + 1 p = 45% --- (1)
1 u + 1 p + 153 = 55% --- (2)

(2) - (1)
55% - 45% = 153 - 43
10% = 110

1% = 110 ÷ 10 = 11

Number of vanilla buns that they made altogether
= 45%
= 45 x 11
= 495

Answer(s): 495