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1 mark

If 10A=3B=7C; find A:B:C

  1. A
    30:70:21
  2. B
    21:70:30
  3. C
    70:21:30
  4. D
    7:3:10

Solution & Step-by-step Explanation

Let 10A=3B=7C=k.
Then,

A=
10
k

,B=
3
k

,C=
7
k


The ratio A:B:C is:

A:B:C=
10
1

:
3
1

:
7
1


To clear fractions, multiply by the LCM of 10,3, and 7, which is 210:

A:B:C=(
10
1

×210):(
3
1

×210):(
7
1

×210)
A:B:C=21:70:30

Practice this question

Try it yourself before checking the explanation above.

If 10A=3B=7C; find A:B:C
A
30:70:21
B
21:70:30
C
70:21:30
D
7:3:10

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