← Back to Quizzes Hints: 2/2 Numbers Set – 8 Medium Start Your name (optional): Share Certificate Browse Quizzes Play Again [{"type":"single","prompt":"84 \u00f7 7 \u00d7 5 = ?","options":["50","55","60","65"],"answer":[2],"explanation":"84 \u00f7 7 = 12, then 12 \u00d7 5 = 60.","hint":"First divide, then multiply."},{"type":"single","prompt":"Find the next number in the series: 9, 18, 30, 45, ?","options":["54","60","63","66"],"answer":[2],"explanation":"Differences are +9, +12, +15 \u2192 each time +3 more. Next difference = 18 \u2192 45+18=63.","hint":"Look at how the gaps are increasing."},{"type":"single","prompt":"35% of 320 is:","options":["96","104","110","112"],"answer":[3],"explanation":"10% of 320 = 32 \u2192 30% = 96, 5% = 16 \u2192 96+16=112.","hint":"Break 35% into 30% + 5%."},{"type":"single","prompt":"Simplify the ratio 45 : 60.","options":["2 : 3","3 : 4","4 : 5","5 : 6"],"answer":[1],"explanation":"Divide both by 15 \u2192 45\u00f715=3, 60\u00f715=4 \u2192 3:4.","hint":"Divide by the highest common factor."},{"type":"single","prompt":"The average of 26, 34, 40, 50 and 60 is:","options":["40","41","42","44"],"answer":[2],"explanation":"Sum = 26+34+40+50+60 = 210; average = 210 \u00f7 5 = 42.","hint":"Add all and divide by number of terms."},{"type":"single","prompt":"A number is increased by 20% and becomes 180. What was the original number?","options":["140","145","150","160"],"answer":[2],"explanation":"Let number = x. 1.20x = 180 \u2192 x = 180 \u00f7 1.2 = 150.","hint":"\u201cIncreased by 20%\u201d means 1.2 times the original."},{"type":"single","prompt":"The LCM of 9, 12 and 15 is:","options":["90","120","150","180"],"answer":[3],"explanation":"9=3\u00b2, 12=2\u00b2\u00d73, 15=3\u00d75 \u2192 LCM = 2\u00b2\u00d73\u00b2\u00d75 = 4\u00d79\u00d75 = 180.","hint":"Use highest power of each prime factor."},{"type":"single","prompt":"Find the simple interest on \u20b96000 at 9% per annum for 2 years.","options":["\u20b9960","\u20b91,000","\u20b91,080","\u20b91,100"],"answer":[2],"explanation":"SI = (P\u00d7R\u00d7T)\/100 = (6000\u00d79\u00d72)\/100 = 6000\u00d70.18 = \u20b91,080.","hint":"Directly apply SI formula PRT\/100."},{"type":"single","prompt":"A train covers 240 km in 3 hours. What is its speed?","options":["70 km\/h","75 km\/h","80 km\/h","90 km\/h"],"answer":[2],"explanation":"Speed = Distance \u00f7 Time = 240 \u00f7 3 = 80 km\/h.","hint":"Use S = D \u00f7 T."},{"type":"single","prompt":"A can finish a work in 10 days and B in 15 days. Working together, they will finish in:","options":["5 days","6 days","7 days","8 days"],"answer":[1],"explanation":"A\u2019s 1-day work = 1\/10, B\u2019s = 1\/15 \u2192 together = 1\/10 + 1\/15 = (3+2)\/30 = 5\/30 = 1\/6. So time = 6 days.","hint":"Add their one-day fractions and take reciprocal."}]
