exam Maths Puzzle Numerical Ability

Jo read 50 pages of a novel in 4 hours.
At the same rate, how long would it take Jo to read 400 pages?

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exam Other Question

solve for x:
log3^4-log3^x=2

no clue!!! Write the equation of the line L which has y-intercept (0,-3) and is parallel to the line with equation y=2/3x+1