The ages of A, B, and C are in the ratio 3:5:7. If the sum of their ages is 90 years, how old is B? Options 20 30 25 35
Question
The ages of A, B, and C are in the ratio 3:5:7. If the sum of their ages is 90 years, how old is B?
Options 20
30
25
35
Solution
Let's solve this step by step:
Step 1: The ratio of the ages of A, B, and C is 3:5:7. This means that if you add the ratios together, you get a total of 15 parts (3+5+7).
Step 2: The sum of their ages is given as 90 years. This means that each part in the ratio represents 90/15 = 6 years.
Step 3: To find the age of B, we multiply the ratio of B's age (which is 5) by the value of each part (which is 6 years). So, B's age is 5*6 = 30 years.
So, B is 30 years old.
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