Tom's mark of a maths test was 68.This was 20% worse than his mark in English.what was Tom's English mark ?
1 answer:
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Answer:
w =
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
w² + 7² = 14²
w² + 49 = 196 ( subtract 49 from both sides )
w² = 147 ( take the square root of both sides )
w =