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slega [8]
3 years ago
8

Twenty less than thrice a number is 223.what is the number​

Mathematics
2 answers:
Tomtit [17]3 years ago
8 0

So I just did 3x-20=223

3x=243

x=243/3

x=81

so the answer would be 81

Vera_Pavlovna [14]3 years ago
6 0

Answer:

81

Step-by-step explanation:

Let the number be y.

20 less than 3 times y = 223

The expression is thus

3y - 20 = 223

Add 20 to both sides to eliminate -20 on the left

3y -20 + 20 = 223 + 20

3y = 243

Divide both sides by 3 to isolate y

3y/3 = 243/3

y = 81

The number is 81

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Answer:

She caught up with Jordan at 6:39 AM

Step-by-step explanation:

We solve this question making linear functions for the distances that Jorden and his mom have driven, and then we equalize them to find the moment they caught up.

Jorden leaves home for school on his bike everyday at 6:00 AM, traveling at 32 km/h.

Her mom will have left 15 minutes after he left, when he will already have traveled \frac{15*32}{60} = \frac{32}{4} = 8\text{km}

So, his position after t minutes can be modeled by the following function:

J(t) = 8 + 32t

His mom

His mom goes after him starting from home, so the initial position is 0, with a velocity of 52 km/h. So her position can be modeled by the following function:

M(t) = 52t

At what time did she catch up with Jorden,

She catches up t minutes after 6:15 AM.

t is found when

M(t) = J(t)

So

8 + 32t = 52t

20t = 8

t = \frac{8}{20}

t = 0.4

0.4 of an hour is 0.4*60 = 24 minutes.

So she catched up with Jordan after 6:15 AM + 24 minutes = 6:39 AM

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2 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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