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xenn [34]
3 years ago
12

One number is 8 times a first number. a third number is 100 more than the first number. If the sum of the three numbers is 420,

find the numbers
Mathematics
1 answer:
Alex17521 [72]3 years ago
6 0

Answer:

(use algebra) 1st no. is a,2nd no. is 8 times the 1st which is 8a, 3rd no. 100 more than 1st which is a+100

total is 420, thus a+8a+a+100=420

10a+100=420, take 100 to the other side

10a=320 hence 32

1st no. is 32, 2nd is 256, 3rd is 356

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Please help me with 9 I really need it
MissTica

Answer:

605 boys

Step-by-step explanation:

If the ratio of boys to girls is 5:7

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we can plug this value into the ratio by doing something like:

5:7

= 5/7

= x/847

Because the ratio has to be the same, we can substitute x for the number of boys and solve by the cross method or whatever you guys call it.

5            x

---   x    ------

7          847

The x in the middle is just to show the direction you are multiplying.

the 5 is multiplied by the 847 and the 7 is multiplied by x.

847 * 5 = 4,235

4,235  divided by 7 is 605

605 is your answer.

The cross method can be used in most situations.

* is used to represent multiplication btw

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Answer:

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Step-by-step explanation:

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