PSLEThere are some stickers in albums S and T. 80% of the stickers in album S and 20% of the stickers in album T are round stickers. There is an equal number of square stickers in both albums. If there are 45 more round stickers in album S than in album T, how many stickers are there in both albums altogether?
S |
T |
Round |
Square |
Round |
Square |
4x4 |
1x4 |
1 |
4 |
16 u |
4 u |
1 u |
4 u |
20% =
20100 =
1580% =
80100 =
45The number of square stickers in both albums is the same. Make the number of square stickers the same. LCM of 1 and 4 is 4.
Number of more round stickers in Album S than Album T
= 16 u - 1 u
= 15 u
15 u = 45
1 u = 45 ÷ 15 = 3
Number of stickers in both albums
= 16 u + 4 u + 1 u + 4 u
= 25 u
= 25 x 3
= 75
Answer(s): 75