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Fractions and Percentages

One equality Common Denominator Form

Problem: I'm trying to prove the following: using the following identity: I have tried various methods, but I am baffled! Incidentally, I would be very grateful if you could also show me how to prove the second formula. Solution: We can solve following identity without using the second one. First

Statistics: Percentages from Groups

When the members of the Eye and I Photo Club discussed what type of film they had used during the past month, the following information was obtained; 77 used black and white film, 24 used only black and white, 65 used color, 18 used only color, 101 used black and white or color, 27 used infrared, 9 used all three types, and 8 di

Understanding sequencing and fraction differences.

Context: It would normally follow on from work on sequences and fractions Question: Ruth was investigating fraction differences. She wrote down this sequence of fractions: 1/1, 1/2, 1/3, 1/4, 1,5 1,6 ... ... Then she worked out the difference between the consecutive fractions: 1/2, 1/6, 1/12, 1/20, 1/30, .. .. Sh