PSLEThere are some stickers in albums K and L. 80% of the stickers in album K and 10% of the stickers in album L are round stickers. There is an equal number of oval stickers in both albums. If there are 420 more round stickers in album K than in album L, how many stickers are there in both albums altogether?
K |
L |
Round |
Oval |
Round |
Oval |
4x9 |
1x9 |
1 |
9 |
36 u |
9 u |
1 u |
9 u |
10% =
10100 =
11080% =
80100 =
45The number of oval stickers in both albums is the same. Make the number of oval stickers the same. LCM of 1 and 9 is 9.
Number of more round stickers in Album K than Album L
= 36 u - 1 u
= 35 u
35 u = 420
1 u = 420 ÷ 35 = 12
Number of stickers in both albums
= 36 u + 9 u + 1 u + 9 u
= 55 u
= 55 x 12
= 660
Answer(s): 660