Multiple Choice Question: All factors being equal, which of the following concrete mixes has the highest 28-day compressive strength?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

A student in a chemistry laboratory wants to form a 32 milliliter mixture of two solutions to contain 30% acid.
One of the rational methods of determining the reservoir-capacity yield analysis in dam design is known as:
sHh2p5G-2 The magnitude of the reaction at A (kN) is nearest to:
The total number of diagonals of an N-gon is 77, then what is N?
A substance goes into a solution at the rate of 25% of the undissolved portion each minute. If the initial amount was 64/27 grams, what amount (in grams) is undissolved after 6 minutes?
Allan and Bernard start at the same time from two places 136 km apart and travel toward each other. Allan travels 10 kph and Bernard 8 kph. If Bernard rests 1 hour on the way, in how many hours will they meet?
Which of the following has the same value as $\cos \theta$?
A sequence of numbers is defined by the relation $\dfrac{a_{n + 1}}{a_n} = 3^n$ and it is known that $a_1 = 1$. Find the value of $\log_3 a_{100}$.
It is a pressure force that acts as the body submerged in a liquid at rest which is equal to the weight of the fluid displaced by the submerged body either partially or completely.
If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now?
If 1200 cm^2 of material is available to make a box with a square base and open top, find the largest possible volume of the box.
Find the equation of the radical axis of the two circles having equations of $x^2 + y^2 + 4x + 6y - 3 = 0$ and $x^2 + y^2 + 12x + 14y + 60 = 0$.
Solve for x if $e^{\ln (1 - x)} = 2x$.
A stone is dropped into a well and the report of the stone striking the bottom is heard 7.7 seconds after it is dropped.
In a bowling game, how many ways can the 10 pins fall in the first throw?

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