They are: reading, writing and arithmetic
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He paid 75 - 5 + 3 - 3 / x + 2 (the tip) = 74, where x = 3 (they were three friends).
The 3 R's stand for: Reduce, Reuse, and Recycle. Perhaps the 3 Rs now stand for something else, but originally, the 3 Rs stood for (R)eading, w(R)iting, and a(R)ithmetic.
3
If 3 men with 4 boys can earn Rs.2940 in 7 days and 5 men with 9 boys earn Rs. 4620 in 6 days in how many days will 5 men with 3 boys earn Rs. 1080 ?
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