PSLE
Risa had two streamers of the same length. She cut the first streamer into equal parts of length 25 cm and to each part she tied 2 pink cartoon cutouts. After that, she cut the second streamer into equal parts of length 40 cm and to each part she tied 4 grey cartoon cutouts. When she finished tying, she counted that there were 16 more grey cartoon cutouts than pink cartoon cutouts. How many cartoon cutouts were there altogether?

	First streamer	Second streamer	Difference	Total
Length of each part	25 cm	40 cm
Number of balloons tied to each part	2 pink balloons	4 grey balloons
LCM	200 cm	200 cm
Number of equal parts	200 ÷ 25 = 8	200 ÷ 40 = 5
Number of balloons for each streamer per set	8 x 2 = 16	4 x 5 = 20	20 - 16 = 4	16 + 20 = 36

LCM of 25 and 40 = 200

Number of sets of 2 pink cartoon cutouts in a length of 200 cm
= 200 ÷ 25
= 8

Number of pink cartoon cutouts in a length of 200 cm
= 8 x 2
= 16

Number of sets of 4 grey cartoon cutouts in a length of 200 cm
= 200 ÷ 40
= 5

Number of grey cartoon cutouts in a length of 200 cm
= 5 x 4
= 20

Extra number of grey cartoon cutouts in a length of 200 cm
= 20 - 16
= 4

Number of sets of cartoon cutouts
= 16 ÷ 4
= 4

Total number of cartoon cutouts in one set of 200 cm of pink balloons and one set of 200 cm of grey balloons
= 16 + 20
= 36

Total number of cartoon cutouts of the two streamers
= 4 x 36
= 144

Answer(s): 144