1019 past contests
Topic 25 · Linear constraints for exercise books ($2$ ghc) and notebooks ($5$ ghc), total $27$ ghc
Topic 25 · Linear constraints for radio adverts ($250$ ghc) and tv adverts ($750$ ghc), budget $10{,}000$ ghc
Topic 25 · Linear constraints for vitamin c pills totalling at least $2{,}500$ mg
Topic 27 · Rate of change of the surface area of a sphere, $\dfrac{da}{dt}$ at $r=10$ cm
Topic 27 · Rate of change of the volume of a sphere, $\dfrac{dv}{dt}$ at $r=10$ cm
Topic 30 · Integrating $3x^2-5x+3$
Topic 30 · Integrating $4x^3-3x^2+2x$
Topic 30 · Integrating $x^2+4x+2$
Topic 8 · Evaluating $\log_5(8)\times\log_2(25)$, $\log_3(16)\times\log_2(27)$ and $\log_5(64)\times\log_4(125)$
Topic 42 · Supplementary-angle identity $\tan(180^\circ-a)=-\tan a$ (true/false)
Topic 11 · Riddle: reflection in the line $y=x$
Topic 42 · Supplementary-angle identity $\sin(180^\circ-a)=\sin a$ (true/false)
Topic 42 · Co-function identity $\cos(90^\circ-a)=\sin a$ (true/false)
Topic 35 · A kite's diagonals are perpendicular (true/false)
Topic 35 · A rhombus's diagonals bisect its angles (true/false)
Topic 9 · Finding the base $n$ when $315_n+574_n=1000_n$
Topic 35 · A general parallelogram's diagonals do not bisect its angles (true/false)
Topic 9 · Finding the base $n$ when $215_n+126_n=343_n$
Topic 9 · Finding the base $n$ when $215_n-126_n=56_n$
Topic 24 · Inverse variation: two carpenters roof a house in $7$ days, so how long do five take?