PSLEThere are some stickers in albums E and F. 90% of the stickers in album E and 20% of the stickers in album F are round stickers. There is an equal number of oval stickers in both albums. If there are 630 more round stickers in album E than in album F, how many stickers are there in both albums altogether?
E |
F |
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 E than Album F
= 36 u - 1 u
= 35 u
35 u = 630
1 u = 630 ÷ 35 = 18
Number of stickers in both albums
= 36 u + 4 u + 1 u + 4 u
= 45 u
= 45 x 18
= 810
Answer(s): 810