David was in need for some money so he decided to clean out the water fountain at the mall he found 20 nickels and quarters. the collection of nickels and quarters totaled to 2.6 how many quarters did david find

David find 8 quarters.

Step-by-step explanation:

Given:

David was in need for some money so he decided to clean out the water fountain at the mall he found 20 nickels and quarters.

The collection of nickels and quarters totaled to 2.6.

Now, to find the quarters David find.

Let the number of nickels be

And the number of quarters be

Thus, the number of nickels and quarters he found:

⇒ .........( 1 )

The totaled of nickels and quarters:

(As 1 nickel=$0.05 and 1 quarter=$0.25)

Now, putting the equation ( 1 ) in the place of we get:

⇒

⇒

Subtracting both sides by 1 we get:

⇒

Dividing both sides by 0.20 we get:

⇒

So, the quarters = 8.

Therefore, David find 8 quarters.

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