Let’s see if you can solve this one.
What is the heigh of the table in cm?
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let’s assume height of the table is T and cat is C and R of tortoise.
let’s write down the equations
T + C – R = 170cm
T + R – C = 130cm
add both the equations
2T + C – R + R -C = 170 + 130 cm
2T = 300cm
T = 150cm