PSLEThere are some stickers in albums J and K. 90% of the stickers in album J and 20% of the stickers in album K are round stickers. There is an equal number of oval stickers in both albums. If there are 840 more round stickers in album J than in album K, how many stickers are there in both albums altogether?
J |
K |
Round |
Oval |
Round |
Oval |
9x4 |
1x4 |
1 |
4 |
36 u |
4 u |
1 u |
4 u |
20% =
20100 =
1590% =
90100 =
910The number of oval stickers in both albums is the same. Make the number of oval stickers the same. LCM of 1 and 4 is 4.
Number of more round stickers in Album J than Album K
= 36 u - 1 u
= 35 u
35 u = 840
1 u = 840 ÷ 35 = 24
Number of stickers in both albums
= 36 u + 4 u + 1 u + 4 u
= 45 u
= 45 x 24
= 1080
Answer(s): 1080