PSLEThere are some stickers in albums U and V. 90% of the stickers in album U and 10% of the stickers in album V are square stickers. There is an equal number of round stickers in both albums. If there are 1280 more square stickers in album U than in album V, how many stickers are there in both albums altogether?
U |
V |
Square |
Round |
Square |
Round |
9x9 |
1x9 |
1 |
9 |
81 u |
9 u |
1 u |
9 u |
10% =
10100 =
11090% =
90100 =
910The number of round stickers in both albums is the same. Make the number of round stickers the same. LCM of 1 and 9 is 9.
Number of more square stickers in Album U than Album V
= 81 u - 1 u
= 80 u
80 u = 1280
1 u = 1280 ÷ 80 = 16
Number of stickers in both albums
= 81 u + 9 u + 1 u + 9 u
= 100 u
= 100 x 16
= 1600
Answer(s): 1600