The ratio 9

The ratio of the present age of Raul and Rohit is 5:7. Four years ago, Rohit age is 12 more than Raul's age. Then find their present age.

Correct answer:

a =  30
b =  42

Step-by-step explanation:

a:b=5:7 b−4 = 12 + (a−4)  7a=5b b−4=12+(a−4)  7⋅ a=5⋅ b b−4=12+(a−4)  7a−5b=0 a−b=−12  Row2−71​⋅ Row1→Row2 7a−5b=0 −0.29b=−12  b=−0.28571429−12​=42 a=70+5b​=70+5⋅ 42​=30  a=30 b=42

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algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem

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