Question

“Create your own word problem with answer explanation. Should not be "too easy". Graded based on creativity, level of thought required (does not mean that it must be "hard" to solve, just must make the person solving think), and completeness of answer.”

Please create an ALGEBRAIC WORD PROBLEM. It does not have to be very hard to solve but the question should have WORDAGE that makes the reader have to think.

Answer 1

Sarah bought 10 liters of cooking oil last month. After that, the price of cooking oil rose up by 3 cents a liter. After the price rose, she bought 5 liters of cooking oil. The net expense for cooking oil was $ 8.70. Find out the old price of cooking oil.

Ans

Let initial cost be x dollars per liter

For 10 litres cost will be 10x dollars

New cost = x - 0.03

Cost of newly bought 5 litres of oil = 5 (x - 0.03) = 5x - 0.15

Total cost = 10x + (5x - 0.15) = 8.7

15x - 0.15 = 8.7

15x = 8.85

x = 8.85/15 = $ 0.59

So old price = $ 0.59 per litre