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1 mark

Find the unknown value of 'x' in the proportion (5x+1):3=(x+3):7

  1. A
    1/8
  2. B
    1/14
  3. C
    1/17
  4. D
    1/16

Solution & Step-by-step Explanation

Given the proportion:
3
5x+1
​
=
7
x+3
​

Cross-multiply to solve for x:

7×(5x+1)=3×(x+3)
35x+7=3x+9
35x−3x=9−7
32x=2
x=
32
2
​
=
16
1
​

Practice this question

Try it yourself before checking the explanation above.

Find the unknown value of 'x' in the proportion (5x+1):3=(x+3):7
A
1/8
B
1/14
C
1/17
D
1/16

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ratio and proportion

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