If you have two numbers and add the first number to 4 times the second, you would get 30. If the second number is added to 4 times the first, you would get 15. What are the two numbers?

Question

Mathematics

Greenie

6 December, 05:35

If you have two numbers and add the first number to 4 times the second, you would get 30. If the second number is added to 4 times the first, you would get 15. What are the two numbers?

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Answers (2)

Know the Answer?

Eileen Ware · Answer 1

The first number is 2 and the second number is 7.

Lauren Cooper · Answer 2

the first number is 2 and the second number is 7

Step-by-step explanation:

Make 2 simultaneous equations:

1st number = x

2nd number = y

X+4y=30

Y+4x=15

Times one equation by 4:

4x+16y=120

Then solve by subtracting the two equations:

4x+16y=120

-

Y+4x=15

= 15y = 105

Y=7

Then substitute y in to find x:

X+4 (7) = 30

X + 28=30

X = 2

Therefore the first number is 2 and the second number is 7