PSLEThere are some stickers in albums X and Y. 80% of the stickers in album X and 20% of the stickers in album Y are oval stickers. There is an equal number of square stickers in both albums. If there are 90 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 |
4x4 |
1x4 |
1 |
4 |
16 u |
4 u |
1 u |
4 u |
20% =
20100 =
1580% =
80100 =
45The number of square stickers in both albums is the same. Make the number of square stickers the same. LCM of 1 and 4 is 4.
Number of more oval stickers in Album X than Album Y
= 16 u - 1 u
= 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Number of stickers in both albums
= 16 u + 4 u + 1 u + 4 u
= 25 u
= 25 x 6
= 150
Answer(s): 150