Question
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The ratio of red to black pens in a drawer is 4 to 7 . Which statement is true? For every 4 red pens, there are 11 black pens. There are exactly 11 pens in the drawer. There could be 12 red pens and 21 black pens. There could be 20 red pens and 28 black pens.

Ask by Bowers Hanson. in the United States
Feb 03,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

Podría haber 12 bolígrafos rojos y 21 bolígrafos negros.

Solution

La afirmación verdadera es: **Podría haber 12 bolígrafos rojos y 21 bolígrafos negros.** **Explicación:** - **Razón original:** La proporción de bolígrafos rojos a negros es 4:7. - **Opción correcta:** 12 rojos y 21 negros mantiene la proporción porque 12/4 = 3 y 21/7 = 3. Ambos valores se multiplican por el mismo factor (3), manteniendo la relación 4:7. Las otras opciones son incorrectas porque: - **Opción 1:** Para cada 4 rojos, habría 11 negros, lo cual no coincide con la proporción original de 4:7. - **Opción 2:** Aunque 11 bolígrafos (4 rojos y 7 negros) cumplen la proporción, la afirmación "exactamente 11" no es necesariamente verdadera ya que puede haber múltiples de la proporción. - **Opción 4:** 20 rojos y 28 negros simplifican a una proporción de 5:7, que no coincide con la proporción original de 4:7.

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Mind Expander

The ratio of red to black pens being 4 to 7 means that for every 4 red pens, there are actually 7 black pens, not 11. So the first statement is definitely false! If you look closely at the last statement, with 20 red pens, you'd simply multiply the ratio by 5, giving you 20 red pens and 35 black pens (5 times 7). Oops, that option isn’t correct either! The only combinations working with this ratio are multiples of 4 and 7, so keep that in mind while solving similar ratio problems.

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