PSLEGwen had two ribbons of the same length. She cut the first ribbon into equal parts of length 40 cm and to each part she tied 3 red flags. After that, she cut the second ribbon into equal parts of length 45 cm and to each part she tied 5 green flags. When she finished tying, she counted that there were 65 more green flags than red flags. How many flags were there altogether?
|
First ribbon |
Second ribbon |
Difference |
Total |
Length of each part |
40 cm |
45 cm |
|
|
Number of balloons tied to each part |
3 red balloons |
5 green balloons |
|
|
LCM |
360 cm |
360 cm |
|
|
Number of equal parts |
360 ÷ 40 = 9 |
360 ÷ 45 = 8 |
|
|
Number of balloons for each ribbon per set |
9 x 3 = 27 |
5 x 8 = 40 |
40 - 27 = 13 |
27 + 40 = 67 |
LCM of 40 and 45 = 360
Number of sets of 3 red flags in a length of 360 cm
= 360 ÷ 40
= 9
Number of red flags in a length of 360 cm
= 9 x 3
= 27
Number of sets of 5 green flags in a length of 360 cm
= 360 ÷ 45
= 8
Number of green flags in a length of 360 cm
= 8 x 5
= 40
Extra number of green flags in a length of 360 cm
= 40 - 27
= 13
Number of sets of flags
= 65 ÷ 13
= 5
Total number of flags in one set of 360 cm of red balloons and one set of 360 cm of green balloons
= 27 + 40
= 67
Total number of flags of the two ribbons
= 5 x 67
= 335
Answer(s): 335