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Ann [662]
3 years ago
13

Alex ran 12.8 km in the morning. After​ lunch, he continued running. When he finished the​ run, he had covered 31.4 km in all. W

rite an equation that can be used to find how far Alex ran after lunch.
Let r be the distance in kilometres that Alex ran after lunch.
Mathematics
1 answer:
Ulleksa [173]3 years ago
3 0

Answer:

12.8 km + r = 31.4 km

Step-by-step explanation:

First, Alex ran 12.8 km, then he ran an r amount of km. Added together they equal 31.4 km.

If you need to solve the equation you subtract 12.8 from 31.4 and will give you the amount of miles he ran after lunch.

Ex.: r = 31.4 km - 12.8 km

      r = 18.6 km

Alex ran 18.6 km after lunch

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Tcecarenko [31]

Answer:

Capacity of old tank =  1650 barrels.    

Capacity of new tank =  2000 barrels.  

Explanation:

  Let a be the capacity of old tank and b be the capacity of new tank.

 A company added a new oil tank that holds 350 barrels of oil more than its old oil tank.

So we have    b - a  = 350 ----------------------equation 1

Together they hold 3650 barrels of oil

                        a + b = 3650 ----------------------equation 2

equation 1 + equation 2

                       2b = 3650 + 350 = 4000

                          b = 2000 barrels.

Substituting in equation 1

                  2000 - a = 350

                            a = 1650 barrels.

Capacity of old tank =  1650 barrels.    

Capacity of new tank =  2000 barrels.        

 

4 0
3 years ago
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<h3>Answer : 8 1/5</h3>

<h3>Way to do</h3>

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