Marco has been saving his loose change for the past month. When Marco took his change to the bank, he received $11.42. He knows he had 83 coins in all. There were 18 nickels, 7 pennies, and the rest were quarters and dimes. To find out the number of quarters he had, Marco set up and solved the system of equations shown below. I + y = 58 0.10x +0.25y = 10.45 %3D How many quarters did Marco have? O 10 O 25 O 31 O 27
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.
Help
Given:
The system of equation is
Solution:
it can be observed that is dimes and is quarters because in second equation 0.25 is multiplied with and 1 quarters worth 25 cents.
The value of can be obtained from equation is
Substitute in to obtain as,
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