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3 years ago

If 70% of a number is 224 and 20% of the same number is 64, find 90% of that number.

Mathematics

1 answer:

kodGreya [7K]3 years ago

5 0

Answer:

the answer is 320.

Step-by-step explanation:

really not that hard. 64*5=320. 224/.7=320.

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What is 6.54 as a mixed number

Andrews [41]

The number given in the question is in decimal form. It has to be first changed to fraction and then only can it be changed to a mixed fraction. The calculations have to be done correctly and then the problem is very straight forward.Now let us concentrate on the problem in hand.
Then
6.54 = 654/100
= 327/50
= 6 27/50
From the above deduction we can definitely conclude that the mixed number for 6.54 is 5 27/50. I hope this simple procedure will help you to attempt such type of problems in future without requiring any additional help.

6 0

4 years ago

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A train to New York city leaves a station every 7 minutes. Another train to Boston leaves the station every 6 minutes. Suppose i

Virty [35]

Answer:

7:12 a.m

Step-by-step explanation:

Given that:

Train to New York city leaves station every 7 minutes

Train to Boston leaves station every 6 minutes

Current time = 6:30 a.m

Time both will leave station together is obtained by finding the least common multiple of 6 and 7

Multiples of ;

6 = 6, 12, 18, 24, 30, 36, 42, 48, 54, 60,...

7 = 7, 14, 21, 28, 35, 42, 49, 56, 63, 70,...

The least common multiple of 6 and 7 is 42.

Hence, both trains will leave the station together after 42 minutes ;

Current time + 42 minutes

6:30 a.m+ 42 minutes = 7:12 a.m

7 0

3 years ago

Two trains leave stations 360 miles apart at the same time and travel toward each other. One train travels at 70 miles per hour

cricket20 [7]

S=d/t   ⇒d=s*t
s=speed
d=distance
t=time

The first train :
d=x

x=70 miles/h*t   ⇒ x=70t (1)

The second train
d=360 miles - x

360 miles - x=80 miles/h*t ⇒360-x=80t   ⇒ x=360-80t (2)

therefore, with the equations (1) and (2) we have a systeme of equations:

x=70t
x=360-80t

we can solve this system of equations by equalization method.

70t=360-80t
70t+80t=360
150t=360
t=360/150=2.4 (≈2 hour 24 minutes)

Answer: the first train meet with the second train in 2 hour 24 minutes.

3 0

3 years ago

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-3(4x+5) a- 7x+15 b- 7x-15 c- -12x-15 d- -12x+15

Alexandra [31]

C, because everything inside the parenthesis is multiplied by -3.

3 0

4 years ago

What is 1 + 2? i do not understanded math???

Temka [501]

The answer is 3 if you add 2 into 1 you get 3

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3 years ago

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