50 students were asked what they did last night. 16 said they read a book, 41 said they watched TV, 7 said they did neither, how many students did both​

14 students

Step-by-step explanation:

Given

Let:

read a book

watched TV

So, we have:

-- total

Required

Students that did both (x)

This is calculated using:

So, we have:

This gives:

Open brackets

Collect like terms

Hence, 14 students did both

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

the answer is 8/21

hope this