exam Maths Puzzle Numerical Ability

Please Help!!!
Substitute the given values into the formula and solve for the unknown variable.
V=one-third Bh;V=20;h=5

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exam Other Question

Complete the ordered pairs so that each is a solution for the given equation. 3x + 4y = 12 (0, ), ( , 3/4), (, 0), 8/3, ) Which of the numbers 18, 48, 452, 486 and 844 are divisible by 4?

Please help. My mind is NOT working today..lol Thank you so much.