PSLEThere are some stickers in albums W and X. 90% of the stickers in album W and 20% of the stickers in album X are square stickers. There is an equal number of round stickers in both albums. If there are 315 more square stickers in album W than in album X, how many stickers are there in both albums altogether?
W |
X |
Square |
Round |
Square |
Round |
9x4 |
1x4 |
1 |
4 |
36 u |
4 u |
1 u |
4 u |
20% =
20100 =
1590% =
90100 =
910The number of round stickers in both albums is the same. Make the number of round stickers the same. LCM of 1 and 4 is 4.
Number of more square stickers in Album W than Album X
= 36 u - 1 u
= 35 u
35 u = 315
1 u = 315 ÷ 35 = 9
Number of stickers in both albums
= 36 u + 4 u + 1 u + 4 u
= 45 u
= 45 x 9
= 405
Answer(s): 405