LlayahHarbin

19.09.2019 • 

Mathematics

Agym is in the process of purchasing new 5-pound and 8-pound dumbbells for their aerobics room. each 5-pound dumbbell costs $8 and each 8-pound dumbbell costs $12. the entire shipment of dumbbells costs $432 and weighs 282 pounds. which equations can be used to find the number of 5-pound dumbbells, x, and the number of 8-pound dumbbells, y, in the shipment?

Ответ:

blake2001

03.01.2022

Mathematics

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Let f=number of five pound and e=number of eight pound dumbbells

5f+8e=282

8e=282-5f

e=(282-5f)/8

...

8f+12e=432, using e found above

8f+12(282-5f)/8=432

64f+12(282-5f)=3456

64f-60f+3384=3456

4f+3384=3456

4f=72

f=18, since e=(282-5f)/8

e=24

So there are 18 five pound and 24 eight pound dumbbells in the shipment.

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Ответ:

mkpayton2006

29.12.2021

Mathematics

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I’m confused to stop stop stop

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