Age Model Question
A is 40% of his brother's age. In 21 years time, A is 75% of his brother's age. What is A's age now?
Here's My Answer
Step 1: This question involves the Constant Difference Concept
. For Percentage questions, more often than not, it is easier to convert the percentages to fractions to facilitate drawing of models. Since A is 40% of his brother's age, we draw 2 boxes to represent A's 40% and 5 boxes to represent his brother's 100%.
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