Numbers questions This is a list of recently added questions about numbers. Play numbers quiz and see all the questions. What's the distance between USA and Russia?4 Km / 2.5 miles . Alaska is only 2.5 miles away from RussiaCreated by: grifi bastionvery hard 36% 4 Km / 2.5 miles 4 Km / 2.5 miles 23740 Km / 25 miles40 Km / 25 miles180400 Km / 250 miles400 Km / 250 miles1104000 Km / 2500 miles4000 Km / 2500 miles127USA riddles » Which currency was the first to be converted to decimal system?Russian ruble. The new ruble introduced with monetary reform of Peter the Great of 1704 was the first currency to be based on decimal system.Created by: smyruvery hard 39% American dolarAmerican dolar940British pound sterlingBritish pound sterling1526frank of revolutionary Francefrank of revolutionary France1591Russian rubleRussian ruble2670coins riddles » What is the sum of all the numbers on the roulette wheel?666. This fact contributed to the naming of the game as Satan one, since 666 it is called the number of the beast by the Book of Revelation.Created by: smyruhard 51% 60060061266666639227837831822100010001278games riddles » Which numeral system was in use in ancient Sumer and Babilon?Sexagesimal. Remnants of highly composite sexagesimal system are in use even today for measuring angles, geographic coordinates and especially time. An hour of time is divided into 60 minutes, which in turn are divided into 60 seconds. Created by: smyruvery hard 32% octaloctal2925binarybinary2570decimaldecimal3178sexagesimalsexagesimal4125mathematics riddles » How many players of one team are there in a pool during the water polo game?7. A team consists of 6 field players and one goalkeeper in the water at any one time. Created by: Paweł Kołodziejczykhard 52% 553585775396998891111416water riddles » Which of the following is true for the solution with the pH=0?The OH − ion concentration is smaller than the H+ ion concentration. In chemistry, pH is a numeric scale used to specify the acidity or alkalinity of an aqueous solution. It is the negative of the logarithm to base 10 of the activity of the hydrogen ion .Traditionally the pH is being defined as: pH = - log10 [H+], where [H+] it is a H+ ions concentration in mol/dm^3 (M). So if pH = 0 this H+ ions concentration is 1 mol/dm^3 and the solution is strongly acidic.Created by: Paweł Kołodziejczykvery hard 25% the OH − ion concentration is smaller than the H+ ion concentrationthe OH − ion concentration is smaller than the H+ ion concentration811the OH − ion concentration is greater than the H+ ion concentrationthe OH − ion concentration is greater than the H+ ion concentration634the OH − ion concentration is equal of the H+ ion concentrationthe OH − ion concentration is equal of the H+ ion concentration887Such solution doesn't existSuch solution doesn't exist837chemistry riddles » What is the volume of a soap bubble with radius R=1 cm?4/3π cm3. Equation for the volume of a sphere: 4/3πR^3.Created by: Paweł Kołodziejczykhard 58% 3/4π cm33/4π cm327014/3π cm34/3π cm382504,3π cm34,3π cm31317It isn't possible to calculateIt isn't possible to calculate1723geometry riddles » What is the result of 2+2*2?6. The multiplication has a priority over addition, and so the result is 2+(2*2) = 2+4 = 6.Created by: Paweł Kołodziejczykvery easy 86% 441598813456611237Not enough dataNot enough data255mathematics riddles » Which of the following numbers is the greatest?1/3. Quite surprisingly, most players answer that both answers 1/3 and 33% are correct. But 1/3 is more than 33%. (it is 33.3333333...)Created by: globalquiz.orghard 53% 1/31/3105220,30,382333%33%1678Both answers 1/3 and 33% are correctBoth answers 1/3 and 33% are correct6661mathematics riddles » Which number is considered unlucky in East Asia?4. Words "four" and "Death" have very similar pronunciation in Chinese, Vietnamese, Korean and Japanese. In East Asia many buildings do not have a 4th floor. Some high-rise residential buildings omit all floor numbers with "4", e.g., 4, 14, 24, 34 and all 40–49 floors. Created by: Sumit Tamanghard 49% 332367445565121225284040681South Korea riddles » Play numbers quiz and see all the questions.