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borishaifa [10]
3 years ago
6

2Decrease R420 in the ratio 4:7​

Mathematics
1 answer:
Oxana [17]3 years ago
4 0

Step-by-step explanation:

Let the numbers are 4x and 7x. According to the question if each number is increased by 20, the ratio becomes 7 : 9.

Then,

( 4x + 20 ) : ( 7x + 20 ) = 7 : 9

9( 4x + 20 ) = 7( 7x + 20 )

9( 4x ) + 9( 20 ) = 7( 7x ) + 7( 20 )

9( 20 ) - 7( 20 ) = 7( 7x ) - 9( 4x )

2( 20 ) = 49x - 36x

40 = 13 x

40 / 13 = x

Therefore, number are :–

4 x = 4( 40 / 13 ) = 160 / 13

7 x = 7( 40 / 13 ) = 280 / 13

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drek231 [11]

At 1:00 Both Jonestown and coopervile have the same temperature

Let Jonestown = J and Cooperville = C

Let X = the temperature of both town

Jonestown

=> 1:00 = x

=> 2:00 = x – 10 degrees

=> 3:00 = x – 10 – 8

Cooperville

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=> 2:00 = x – 6

=> 3:00 = x – 6 – 2

Now, which town is colder.

The answer is the Jonestown because the temperature dropped to total of 18 compare to Cooperville which is only 8.

3 0
2 years ago
How do i do this, my son is struggling and he needs help
expeople1 [14]

Answer:

32

Step-by-step explanation:

angle a is the outside angle. It creates a circle that will always equal 360 degrees. Since the outside angle is 302, the inside angle must be 58 degrees (360-302). The top square angle will be 90 degrees (a square angle is always 90 degrees). Since the angles in a triangle always add up to 180 degrees, we need to add 58 and 90, and then subtract it from 180, which equals 32. So, angle x equals 32.

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2 years ago
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What's 7-(7-7):8x29=
topjm [15]

Answer:

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Step-by-step explanation:

by solving both sides we get ,

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Answer:

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Step-by-step explanation:

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Answer:

K-a Positive constant that depends on the area and nature of the surface of the body under consideration.

Step-by-step explanation:

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