Question

In a jar of marbles 9 out of 15 marbles are purple. Of there are 400 marbles in the jar, how many of th are not purple?

a)6
b)9
c)160
d)1000​

Answer 1

C) 160

Explanation:

Set up a proportion:

`(9)/(15)` =
`(x)/(400)`

Cross multiply and solve for x:

15x = 3600

x = 240

This means in 400 marbles, 240 are purple.

To find how many are not purple, subtract 240 from 400:

400 - 240

= 160 marbles

So, 160 marbles are not purple