annamo137 annamo137

20-01-2015
Mathematics

contestada

A teacher had 21 red pens. If the ratio of red pens to blue pens she owned was 3:1, how many pens did she have total?

Respuesta :

konrad509 konrad509

20-01-2015

x - blue pens

[tex]\dfrac{21}{x}=\dfrac{3}{1}\\ 3x=21\\ x=7\\\\ 21+7=28[/tex]

28 in total

Answer Link

Otras preguntas

How do you solve 4x-7=2x+15

Rewrite the equation in vertex form: y=x^2-8x+13

what part of speech ,inference ,and the definition of the word abominable ?

Who wrote the dystopian novel Nineteen-Eighty-Four in which Newspeak demonstrates the heightened linguistic self-consciousness of modernist writers? a) George

I lost my English book what do I do?

What are the different types of erosion?

An analogy from civil disobedience

need to lose one electron to form a stable octet b. alkali metals c. alkaline earth metals d. noble gases e. lanthanides

express 8 square roots of -65 in terms of i

what does jupiter and saturn have in common and what do they don't