PSLEThere are some stickers in albums S and T. 50% of the stickers in album S and 20% of the stickers in album T are oval stickers. There is an equal number of round stickers in both albums. If there are 15 more oval stickers in album S than in album T, how many stickers are there in both albums altogether?
S |
T |
Oval |
Round |
Oval |
Round |
1x4 |
1x4 |
1 |
4 |
4 u |
4 u |
1 u |
4 u |
20% =
20100 =
1550% =
50100 =
12The 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 oval stickers in Album S than Album T
= 4 u - 1 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of stickers in both albums
= 4 u + 4 u + 1 u + 4 u
= 13 u
= 13 x 5
= 65
Answer(s): 65