PSLEThere are some stickers in albums Y and Z. 90% of the stickers in album Y and 10% of the stickers in album Z are round stickers. There is an equal number of square stickers in both albums. If there are 960 more round stickers in album Y than in album Z, how many stickers are there in both albums altogether?
Y |
Z |
Round |
Square |
Round |
Square |
9x9 |
1x9 |
1 |
9 |
81 u |
9 u |
1 u |
9 u |
10% =
10100 =
11090% =
90100 =
910The 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 round stickers in Album Y than Album Z
= 81 u - 1 u
= 80 u
80 u = 960
1 u = 960 ÷ 80 = 12
Number of stickers in both albums
= 81 u + 9 u + 1 u + 9 u
= 100 u
= 100 x 12
= 1200
Answer(s): 1200