Question
A man spends 1/7 of his income on food, 3/5 of his
income house rent and 1/4 of his income on clothes. If he still has Rs. 200 left with him, his income is:Solution
Let the man’s income be ₹ p. According to the question, => p - p/7 - 3p/5 - p/4 = 200 => p(1 − 1/7 - 3/5 - 1/4) = 200    => p{(140 - 20 - 84 - 35)/140)} = 200 => p × 1/140 = 200 => p = 140 × 200 = Rs 28000
If rxy = 0.75, then ryx will be:
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