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!

Answer 1

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

Answer 2

Please help, does this calculation looks right?

r-21 x 3/b= 2/5
r-21x15=2b
r-315=2b I'm stuck????