Question

The sum of a number and 4 times itself is 80. What is the number?
2 One number is 3 times as large as another. The sum of the numbers is 102. Find the numbers,
4
3. Three-fourth of a number is greater than two-third of the number by 10. Find the number.​

Answer 1

Step-by-step explanation:

1.soln: let the number be x

4x+x=80

5x=80

x=80/5

x=16

2.soln: let the number be x

3x+x=x+102

4x=x+102

4x-x=102/4

3x=102

x=102/3

x=34

3.soln: let the number be x

3x/4=2x/3+10

3x/4-2x/3=10

9x-8x/12=10

x/12=10

x=10×12

x=120

Answer 2

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1.soln: let the number be x

4x+x=80

5x=80

x=80/5

x=16

2.soln: let the number be x

3x+x=x+102

4x=x+102

4x-x=102/4

3x=102

x=102/3

x=34

3.soln: let the number be x

3x/4=2x/3+10

3x/4-2x/3=10

9x-8x/12=10

x/12=10

x=10×12

x=120