PSLERoshel had two ribbons of the same length. She cut the first ribbon into equal parts of length 35 cm and to each part she tied 2 grey flags. After that, she cut the second ribbon into equal parts of length 50 cm and to each part she tied 5 silver flags. When she finished tying, she counted that there were 75 more silver flags than grey flags. How many flags were there altogether?
|
First ribbon |
Second ribbon |
Difference |
Total |
Length of each part |
35 cm |
50 cm |
|
|
Number of balloons tied to each part |
2 grey balloons |
5 silver balloons |
|
|
LCM |
350 cm |
350 cm |
|
|
Number of equal parts |
350 ÷ 35 = 10 |
350 ÷ 50 = 7 |
|
|
Number of balloons for each ribbon per set |
10 x 2 = 20 |
5 x 7 = 35 |
35 - 20 = 15 |
20 + 35 = 55 |
LCM of 35 and 50 = 350
Number of sets of 2 grey flags in a length of 350 cm
= 350 ÷ 35
= 10
Number of grey flags in a length of 350 cm
= 10 x 2
= 20
Number of sets of 5 silver flags in a length of 350 cm
= 350 ÷ 50
= 7
Number of silver flags in a length of 350 cm
= 7 x 5
= 35
Extra number of silver flags in a length of 350 cm
= 35 - 20
= 15
Number of sets of flags
= 75 ÷ 15
= 5
Total number of flags in one set of 350 cm of grey balloons and one set of 350 cm of silver balloons
= 20 + 35
= 55
Total number of flags of the two ribbons
= 5 x 55
= 275
Answer(s): 275