If Rakesh’s income exceeds Surinder’s income by 90% and Surinder’s income is less than Sandeep’s income by 10%, then find the ratio of the incomes of Rakesh and Sandeep.
171 ∶ 100
The correct answer is 171 ∶ 100.
Alternatively, you could start by assuming Surinder's income is 'x' and express Rakesh's income in terms of 'x', and Surinder's income in terms of Sandeep's income, and then solve for the ratio. However, using 100 as a base simplifies calculations when percentages are involved. Remember that ratios represent the relative sizes of quantities. The ratio $171:100$ means that for every 100 units of income Sandeep has, Rakesh has 171 units.
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