exam Maths Puzzle Numerical Ability

-4-[-(-5)]+|-6| i have no idea how to do this problem

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exam Other Question

avg speed to car 1 = 55 mph
avg speed of car 2 = 70 mph
time elapsed between start of car 1 and start of car 2 = 4 minutes
how long before cars2 overtakes car 1? Hi,
how can I solve problems that have variables in both sides?

for example 25y/36 = 33/2y