Bob is three years older than his brother. The sum of their ages is 33. How old is bob?

Let's make Bob "x".

Brother: x - 3.

x + x-3 = 33.

Solve:

x + x - 3 = 33.

2x = 33 + 3.

2x = 36.

x = 18.

Bob is 18.

Brother is 18 - 3 = 15.

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