Answer:
• 109 lb 1 oz
• 115 gal 3 qt 1 pt
• 111 yd 8 in
Explanation:
The relevant unit relationships are ...
1 lb = 16 oz
1 gal = 4 qt
1 qt = 2 pt
1 yd = 3 ft = 36 in
To convert from one unit to another, multiply by a fraction that has ...
(to unit)/(from unit)
For example, to convert (13 oz)×5 = 65 oz to pounds, multiply by (1 lb)/(16 oz). This will give you ...
(65 oz)·(1 lb)/(16 oz) = 65/16 lb = 4 1/16 lb
Now, if you don't already recognize that 1/16 lb = 1 oz, you can multiply the fraction by the unit conversion from lb to oz: (16 oz)/(1 lb). Doing that gives ...
(1/16 lb)·(16 oz)/(1 lb) = 16/16 oz = 1 oz
When the same units are in the numerator and denominator, they cancel, as do any factors that appear in both numerator and denominator.
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1. (21 13/16 lb)×5 = 105 65/16 lb = 109 1/16 lb = 109 lb 1 oz
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2. (12 7/8 gal)×9 = 108 63/8 gal = 115 7/8 gal = 115 gal 3 qt 1 pt
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3. ((15 2/3 +8/36) yd)×7 = (105 14/3 + 56/36) yd = 109 yd 2 ft + 1 yd 20 in
= 111 yd 8 in
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Additional explanation
7/8 gal = 7 pt = 1 pt + 3·2 pt = 1 pt + 3 qt
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14/3 yd = 4 2/3 yd = 4 yd 2 ft
56/36 yd = 1 20/36 yd = 1 yd + (12 +8)/36 yd = 1 yd + 1 ft + 8 in
Then 14/3 yd + 56/36 yd = (4 yd + 2 ft) + (1 yd + 1 ft + 8 in) = 6 yd + 8 in