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The ratio of the ages of A and B is 4:5. If A is 20 years old, how old is B? (20
The ratio of the ages of A and B is 4:5. If A is 20 years old, how old is B? (2019)
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Q1
The ratio of the ages of A and B is 4:5. If A is 20 years old, how old is B? (2019)
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Let the age of B be 5x. Since A's age is 4x = 20, x = 5. Therefore, B's age = 5 * 5 = 25.
Questions & Step-by-step Solutions
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Q
Q: The ratio of the ages of A and B is 4:5. If A is 20 years old, how old is B? (2019)
Solution:
Let the age of B be 5x. Since A's age is 4x = 20, x = 5. Therefore, B's age = 5 * 5 = 25.
Steps: 7
Show Steps
Step 1: Understand the ratio of ages. The ratio of A's age to B's age is 4:5.
Step 2: Let A's age be represented as 4x and B's age as 5x, where x is a common multiplier.
Step 3: We know A's age is 20 years. So, we can set up the equation: 4x = 20.
Step 4: Solve for x by dividing both sides of the equation by 4: x = 20 / 4.
Step 5: Calculate x: x = 5.
Step 6: Now, find B's age using the value of x. B's age is 5x, so B's age = 5 * 5.
Step 7: Calculate B's age: B's age = 25.
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