In a cake shop, 3 durian puffs and 4 apple pies cost $19.60. Jill was given a special offer. For every 9 durian puffs bought, she was given 1 apple pie for free. In the end, she paid only $67.60 for 18 durian puffs and 6 apple pies. Find out the original price of 1 durian puff.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
In a cake shop, 3 durian puffs and 4 apple pies cost $19.60. Jill was given a special offer. For every 9 durian puffs bought, she was given 1 apple pie for free. In the end, she paid only $67.60 for 18 durian puffs and 6 apple pies. Find out the original price of 1 durian puff.
Assume that price of one durian puff is $ x and, price of one apple pies cost $ 19.60.
Given that, 3 puff and 4 pie cost $ 19.60, thus,
Now, she bought 18 puffs, thus she will get pies free, and will pay only for 6-2=4 pies. Thus,
subtracting (1) from (2),
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