book Maths Puzzle Numerical Ability

two numbers differ by 18. Four times the smaller is 57 more than the larger. Find the numbers.

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book Other Question

The equation C=5(F-32)/9 gives the relation between Fahrenheit and Celsius temperatures. Find the temperature at which the reading is the same on both thermometers. I need help with this problem : 7x/-3 < 2. I know the answer is -6/7. But every time I work the problem, I come up with -4/5. Can you give me the steps?