A box contains blue, red, and green pens. 25% of the pens are green and 35% are red. 48 blue pens cannot be used, but the remaining 40% of the blue pens are usable

How many blue pens are there?

How many pens are there altogether in the box

number of blue pen = 128

Number of pen in the box = 320

Step-by-step explanation:

Number of blue pen is 80

Total number of all pens(green,blue and red) is 200

Step-by-step explanation:

A detailed look at the attached image would provide a proper explanation.

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950