Devi bought some red and blue beads to make necklace. The ratio of the number of red beads to the number of blue beads is 3:5. After making the necklace, the ratio of the number of red beads to the number of blue beads became 2:5. A total of 21 red beads and 2/3 of the blue beads were used to make the necklace.

Question

Devi bought some red and blue beads to make necklace. The ratio of the number of red beads to the number of blue beads is 3:5. After making the necklace, the ratio of the number of red beads to the number of blue beads became 2:5. A total of 21 red beads and 2/3 of the blue beads were used to make the necklace.
How many red and blue beads did Devi buy altogether?

Please help!

oobleck · Accepted Answer

r/b = 3/5 (r-21)/(b/3) = 2/5 now work your magic. be sure to check your answer.

BRYAN · Answer

Please help, does this calculation looks right? r-21 x 3/b= 2/5 r-21x15=2b r-315=2b I'm stuck????