Answer:
- 36 yd 1 ft 3 in
- 41 yr 5 mo 7 da
- 59 lb 2 oz
Step-by-step explanation:
1. Use the conversions 1 yd = 3 ft, 1 ft = 12 in.
(12 yd +2 ft +10 in) +(6 yd +1 ft +8 in) +(16 yd +2 ft +9 in)
= (12 +6 +16) yd + (2 +1 +2) ft + (10 +8 +9) in
= 34 yd + 5 ft + 27 in
= 34 yd +5 ft + (2 ft +3 in) . . . . convert 27 in to feet and inches
= 34 yd + 7 ft + 3 in . . . . . . . . . add feet
= 34 yd + 2 yd + 1 ft + 3 in . . . . convert 7 ft to yards and feet, then add yards
= 36 yd + 1 ft + 3 in
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2. Use the conversions 1 yr = 12 mo, 1 mo = 30 da. (To be more accurate, we need to know the starting date of each time period.)
(8 yr +9 mo +23 da) +(12 yr +11 mo +16 da) +(19 yr +7 mo +28 da)
= (8 +12 +19) yr +(9 +11 +7) mo +(23 +16 +28) da
= 39 yr +27 mo +67 da
= 39 yr + 27 mo + 2 mo +7 da . . . . . convert 67 da to mo and da
= 39 yr + 2 yr + 5 mo + 7 da . . . . . . . convert 29 mo to yr and mo
= 41 yr +5 mo +7 da
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3. Use the conversion 1 lb = 16 oz.
(15 lb +12 oz) +(19 lb +15 oz) +(23 lb +7 oz)
= (15 +19 +23) lb +(12 +15 +7) oz
= 57 lb +34 oz
= 57 lb +2 lb + 2 oz . . . . . convert 34 ounces to pounds and ounces
= 59 lb +2 oz
