book Maths Puzzle Numerical Ability

Dr. Z covered 310 miles by traveling for 4 hours at one speed and then for 5 hours at another speed. had she gone 5 hours at the first speed and 4 hours at the second speed, she wo

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A = B + 3 (4 - C)
If B equals 5 and C equals 2, what is the value of A? 1. 7(x-1)+5=-2(3-4x)+5
2. 2(3-z)=16-2(3+2z)
3. 8y-3(4-2y)=6(y+1)-2
4. 3+7(x+1)=6-(5+2x)
5. 7(a-1)+4=-(2a-4)+6a+2
6. -2(3-4z)+7z=13z-4
7. -4(2x-5)+3x=x-28
8. 5-(x+8)+6x=4(x+2