Register
the sum of two numbers is 21.Five times the first number added to 2 times the second number is 66.Find the two numbers.
234k views
2 votes
the sum of two numbers is 21.Five times the first number added to 2 times the second number is 66.Find the two numbers.

the sum of two numbers is 21.Five times the first number added to 2 times the second-example-1
User Mujadid Mughal
by
8.3k points

2 Answers

6 votes
Call them x and y. Thus
x + y = 21 and then
5x + 2y = 66
Multiply the top equation by two and subtract from the bottom one...
5x + 2y = 66
-(2x + 2y = 42)
and we get
3x = 24
x = 8
y = 21-x = 13
User Matteo Merli
by
10.1k points
1 vote
a + b = 21 / x 5
5a + 5b = 105 -
5a + 2b = 66
--------------------
3b = 39
b = 39 : 3
b = 13
a = 31 -13
a = 18
User Holger Leichsenring
by
7.4k points
← Prev Question Next Question →

No related questions found

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Other Questions

How do you estimate of 4 5/8 X 1/3
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Write words to match the expression. 24- ( 6+3)
The cost of 5 similar digital cameras and 3 similar video cameras is 3213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he
Mr. Jacob is 55 years old and tony is 7 years old. in how many years will mr. Jacobs be 4 times as old as Tony
Link Copied!