Louisa used red, blue and yellow beads to make some bracelets. She used twice as many red beads as blue beads and thrice as many yellow beads as red beads. She used 105 more yellow beads than blue beads. How many beads did she use altogether?
r = 2b
y = 2r = 4b
y = b+105
4b = b+105
b = 35
so she used 70+140+35 = 245 beads