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Aspen has 306 green beads and 210 silver beads. For every 5cm of a belt that Aspen sews, they use 40 green beads and 24 silver beads.
After how many centimeters of the belt will Aspen have equal numbers of green and silver beads left?

◻cm

Aspen has 306306 green beads and 210210 silver beads. For every 5cm5\,\text{cm} of a belt that Aspen sews, they use 4040 green beads and 2424 silver beads.\newline After how many centimeters of the belt will Aspen have equal numbers of green and silver beads left?\newline\squarecm\text{cm}

Full solution

Q. Aspen has 306306 green beads and 210210 silver beads. For every 5cm5\,\text{cm} of a belt that Aspen sews, they use 4040 green beads and 2424 silver beads.\newline After how many centimeters of the belt will Aspen have equal numbers of green and silver beads left?\newline\squarecm\text{cm}
  1. Calculate ratio: Calculate the ratio of green to silver beads used per 5cm5\,\text{cm} of belt.\newlineGreen to silver ratio = 4040 green beads : 2424 silver beads.
  2. Simplify ratio: Simplify the ratio to find the smallest whole number ratio.\newline408=5\frac{40}{8} = 5 green beads and 248=3\frac{24}{8} = 3 silver beads.\newlineSo, the simplified ratio is 55 green beads : 33 silver beads.
  3. Find sets needed: Find out how many sets of beads Aspen can use before running out.\newlineGreen bead sets = 3065=61.2\frac{306}{5} = 61.2 sets.\newlineSilver bead sets = 2103=70\frac{210}{3} = 70 sets.
  4. Calculate green beads: Since Aspen can't use a fraction of a set, they can use only 6161 full sets of green beads.
  5. Calculate silver beads: Calculate the number of silver beads used after 6161 sets.\newlineSilver beads used = 6161 sets ×3\times 3 silver beads/set = 183183 silver beads.
  6. Calculate silver beads left: Calculate the number of silver beads left after using 6161 sets.\newlineSilver beads left =210183=27= 210 - 183 = 27 beads.
  7. Calculate green beads left: Calculate the number of green beads left after using 6161 sets.\newlineGreen beads left = 306(61 sets×5 green beads/set)=306305=1306 - (61 \text{ sets} \times 5 \text{ green beads/set}) = 306 - 305 = 1 bead.

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