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Everyday Math Calculator
Everyday arithmetic, reviewed October 2026 — exact for the inputs typed, not a substitute for certified measurement or medical advice.
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The rule of three finds the fourth value when three are known and two quantities scale together: if a gives b, then c gives b × c ÷ a. If 3 kg costs ₹150, then 5 kg costs 150 × 5 ÷ 3 = ₹250. It is the everyday engine for unit pricing, currency-style scaling, and sizing quantities up or down.
Put the reference pair in A and B (3 kg → ₹150) and your new quantity in C (5 kg). Read the answer as the matching value for C. The arrangement matters: A and C must be the same kind of quantity (both weights), B and the answer the other kind (both prices) — mixing kinds is the single most common error.
It assumes direct proportion only — quantities rising together. Inverse relationships (more workers, fewer days) need the reciprocal arrangement, and percentage-on-percentage problems belong on the percent tools.
Direct proportion only — not inverse relationships.
If 3 kg costs ₹150, then 5 kg costs 150 × 5 ÷ 3 = ₹250. That is the rule of three at work.
They solve the same kind of proportion; use whichever layout matches how you have the numbers.
Not directly — this page assumes both quantities move together. For inverse cases (speed vs time, workers vs days), invert one pair before computing.
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