211. If 30 men can build a wall 56 meters long in 5 days, what length of a similar wall can be built by 40 men in 3 days ?

212. In a dairy farm, 20 cows eat 20 bags in 20 days. In how many days one cow will eat one bag of husk ?

213. If 4 men reap 40 acres in 30 days, how many acres will 18 men reap in 12 days?

214. A certain number of answer sheets can be checked in 12 days working 5 hours each day by 9 examiners. For how many hours a day should 4 examiners work to check twice the number of answer sheets in 30 days ?

215. log_xY = 100 and log₂x = 10, then the value of y is ?

216. What is the value of log(ab²) - log(ac) + log(abc⁴) - 3log(bc) ?

217. The value of log 9/8 - log 27/32 + log 3/4 is ?

218. The simplified form of log (75/16) - 2 log (5/9) + log (32/343) is ?

219. Find the value of log (a² / bc) + log (b² / ac) + log (c² / ab) ?

220. The equation log_a (x) + log_a (1+x) = 0 can be written as ?

221. If 10⁰.3010 = 2, then find the value of log 0.125 (125) ?

222. log₁₀(10) + log₁₀(100) + log₁₀(1000) + log₁₀(10000) + log₁₀(100000) is equal to ?

223. The value of log₂(1/64) is ?

224. If log 125 / log 5 = x, then x is equal to ?

225. If the probability that A will live 15 year is 7/8 and that B will live 15 year is 9/10, then what is the probability that both will live after 15 year ?

226. A bag contains 8 red and 5 white balls. 2 balls are drawn at random. What is the probability that both are white ?

227. Three unbiased coins are tossed. What is the probability of getting at most two heads ?

228. A brother and sister appear for an interview against two vacant posts in an office. The probability of the brother's selection is 1/5th and that of the sister's selections is 1/3rd. What is the probability that one of them is selected ?

229. Four whole number taken at random are multiplied together. The chance that the last digit of the product is 1, 3, 7, or 9 is ?

230. The probability that a card is drawn from a pack of 52 cards will form a pack of 52 cards will be diamond or king is ?

231. The probability of getting heads in both trials when a balanced coin is tossed twice will be ?

232. A card is drawn from a well-shuffled pack of cards. The probability of getting a queen of club or king of the heart is ?

233. The probability of drawing a red card from a deck of playing cards is ?

234. When two dice are rolled, what is the probability that the sum of the numbers appeared on them is 11 ?