A is 27 years old .B is one third older.how many years ago was the ratio of A' age to B's age equal to 4:7
Answers
Answered by
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4/7=(A-X)/(B-X)
4/7=(27-X)/(27+9-X) CROSS MULTIPLY.
7(27-X)=4(36-X)
189-7X=144-4X
-7X+4X=144-189
-3X=-45
X=-45/-3
X=15 YEARS AGE THEIR AGES WERE 4:7
PROOF:
(27-15)/(36-15)
12/21=4/7
12*7=21*4
84=84
4/7=(27-X)/(27+9-X) CROSS MULTIPLY.
7(27-X)=4(36-X)
189-7X=144-4X
-7X+4X=144-189
-3X=-45
X=-45/-3
X=15 YEARS AGE THEIR AGES WERE 4:7
PROOF:
(27-15)/(36-15)
12/21=4/7
12*7=21*4
84=84
Answered by
1
the amswer of this qiestion is 84
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