Question

a plastic bin contains red yellow and green keychains out of 350 keychains 10% or yellow of the remaining keychains 3/5 are green how many red key chains are inside the bin

Answer 1

Answer: There are 126 red key chains.

Explanation:

1. You know that 10% are yellow, then:

350*0.1=35 (35 key chains are yellow).

2. And you know that of the remaining key chains 3/5 there are green.

The remaining is:

350-35=315

Then:

325*3/5=189 (189 key chains are green).

3. Then, the number of key chains that are red is:

350-35-189=126 (126 key chains are red).