Question

Noor wants to spend less than $20 on condiments. Each kilogram of salt costs $1.50, and each kilogram of

pepper costs $2.50.
Write an inequality that represents the number of kilograms of salt (S) and pepper (P) Noor can buy on
her budget.

Answer 1

`1.50S+2.50P<20`

Explanation:

Givens:

• The number of kilograms of salt is
  `S`.
• The number of kilograms of pepper is
  `P`
• Noor wants to spend less than $20, that means he's gonna spend $18, $17, $16, ...
• Salt per kg costs $1.50.
• Pepper per kg costs $2.50

The cost of the salt would be expressed

`1.50S`

The cost per kilogram of pepper would be

`2.50P`

The whole problem is modelled by this inequality

`1.50S+2.50P<20`

Basically, this expression states that Noow is not gonna pay $20 or more, and the price of salt per kg is $1.50 and $2.50 per kg of pepper.