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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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3 years ago
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In a certain room, there are 28 women and 21 men. What is the ratio of
marishachu [46]

Answer:

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Step-by-step explanation:

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The ratio of women to total number of people is

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4 0
4 years ago
HURRY! What value of m completed the two-way table?
vlabodo [156]
<h3>Answer:  13</h3>

=========================================================

Explanation:

We're told that there are 50 people in each grade that are surveyed. So that means 50 eighth graders were surveyed.

Add up the values along the bottom row. Set the sum equal to 50 and solve for m

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Then note how 13+8+29 = 50 along the bottom row. Also, for the top row we have 17+15+18 = 50 as well.

8 0
3 years ago
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