PSLEThere are some stickers in albums X and Y. 80% of the stickers in album X and 10% of the stickers in album Y are oval stickers. There is an equal number of square stickers in both albums. If there are 490 more oval stickers in album X than in album Y, how many stickers are there in both albums altogether?
X |
Y |
Oval |
Square |
Oval |
Square |
4x9 |
1x9 |
1 |
9 |
36 u |
9 u |
1 u |
9 u |
10% =
10100 =
11080% =
80100 =
45The number of square stickers in both albums is the same. Make the number of square stickers the same. LCM of 1 and 9 is 9.
Number of more oval stickers in Album X than Album Y
= 36 u - 1 u
= 35 u
35 u = 490
1 u = 490 ÷ 35 = 14
Number of stickers in both albums
= 36 u + 9 u + 1 u + 9 u
= 55 u
= 55 x 14
= 770
Answer(s): 770