What number increased by 20 percent equals 78?

65.

Step-by-step explanation:

Let x represent our required number.

We are asked to find the number which is equal to 78 when increased by 20 percent.

After increasing by 20%, our number would be .

To solve for x, we will set an equation as:

Therefore, our required number is 65.

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