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Solution |
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1) Mr. Barry thought he was ordering square linoleum tiles that measured exactly 1 foot along the edge. He bought five cases of twelve tiles because the hallway he wants to tile is 15 feet long by 4 feet wide. It turns out that all the linoleum squares are 0.03 feet less than 1 foot along each edge. When he lays a single row of tiles the length of the hallway, what length gap will he have at the end? Express your answer to the nearest inch.
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The gap is 15 times how much each tile is short =
15 x 0.3 ft = 0.45 ft = 5.4 in =
5 inches to nearest inch.
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2) Kam is playing with a balance. On one side he has a rock. On the other side he has 15 quarters and 10 dimes. The rock side is heavier. When he adds a penny the coin side is heavier. A quarter weighs 5.67 grams. A dime weighs 2.268 grams. A penny weighs 2.5 grams. What is the range of possible weights for the rock to the nearest hundredth of a gram? Give a lower and an upper value for the range.
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1. Add up the weight of 15 quarters:
85.05 gms + 10 dimes = 22.68 grams.
Total first weight = 107.73 grams.
2. Add the weight of a penny to the above weight = 110.23 grams.
3. The range is between these two numbers: =
107.74 to 110.22 grams.
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3) Does 9/10 of one cent matter? If 10,000 people buy 10 gallons of gas at the price of $2.85 9/10 cents per gallon at a gas station, how much money does the 9/10 of one cent contribute to the total amount? Express your answer in dollars and cents. |
Compute how much 10,000 x 10 gallons x 9/10 cents/gallon is: 90000 cents = $900.
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