KA-0112●●●5 points, difficulty 3 of 35 ptLevel 5–6not yet calibratedA class of 12 scored an average of 8. Another class of 18 scored an average of 13. What is the average for all 30 students together?MOD-08Mixtures and weighted averagesalso NUM-15, NUM-11
KA-0137●●●5 points, difficulty 3 of 35 ptLevel 3–4not yet calibratedA jug holds 900 ml of juice. A third is poured out, then 150 ml is added. How many millilitres are in the jug?MOD-10Multi-step arithmetic word problemsalso NUM-09, MOD-07
KA-0159●●●5 points, difficulty 3 of 35 ptLevel 7–8not yet calibratedOne tap fills a tank in 6 hours. A second tap fills the same tank in 4 hours. Both taps are opened together on an empty tank. How long does it take to fill?MOD-04Combined work ratesalso NUM-09, CFT-11