exam Maths Puzzle Numerical Ability

WHAT PERCENT OF 144 IS 126?

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exam Other Question

Find the pH if H+ = 2.68 * 10^-3 mole per liter.
(pH = -logH+ or 10^-pH = H+) A car travels 240 miles on 15 gallons of gas. How far can the car travel on 20 gallons of gas?