book Maths Puzzle Numerical Ability

3-(4-5)+(-5)x6+14
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4(-1-2)

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Consider the lines l: {{{x = x(sub 0) + tv}}} and m: {{{x = x(sub 1) + su}}}. Show that l and m intersect if and only if {{{x(sub 0) - x(sub 1)}}} lies in The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers.