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In a mixture of three varities of oils , the ratio of their weight is 4 : 5 : 8. If 5 kg of oils of the first variety, 10 kg of the second variety and some quantity of oils of the third variety are added to the mixture, the ratio of the weights of three varieties of oils becomes as 5 : 7 : 9 in the final mixture, find the quantity of third variety of oil was ?
A box contains 6 bottles of variety 1 drink, 3 bottles of variety 2 drink and 4 bottles of variety 3 drink. Three bottles of them are drawn at random, what is the probability that the three are not of the same variety.
Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent
একটি ড্রেন থেকে 1000 mL ময়লা পানি সংগ্রহ করে তার COD নির্ণয়ের জন্য DO পরিমাণ করতে গিয়ে দেখা গেল 50 mL নমুনা পানির জন্য 0.015 N Na2S2O3  দ্রবণের 10mL লেগেছে। ঐ নমুনা পানিতে H2SO4 ও         K2Cr2O7 যোগ করার 3 ঘণ্টা পর পুনরায় DO নির্ণয় করতে গিয়ে দেখা গেল এর 50 mL পানির জন্য    0.15 N Na2S2O3 দ্রবণের 3.5 mL লেগেছে। ঐ নমুনা পানির COD গণনা কর।
In a cafe, 60% boys play PUBG(player unknown’s battlegrounds) and 40% boys play COD(call of duty). If 10% boys play both the games, then what percent of students play neither PUBG nor COD?
Calculate the volume for the UASB with the following details. Flow: 120m3/h COD: 350 mg/L UASB load considered: 6 Kg COD/ m3
Calculate the volume for the UASB with the following details. Flow: 240m3/h COD: 350 mg/L UASB load considered: 8 Kg COD/ m3
What is the COD (chemical oxygen demand) of ethanol, expressed as g COD/g ethanol?
The optimal removal of phosphate by biological method should have a COD/P ratio of 20g COD/g of phosphate.
A variety of wheat costing Rs. 27/kg is mixed with another variety in the ratio of 2 ∶ 3. If the mixture is sold at Rs. 24/kg making a loss of 20% then what is the cost of 2nd variety of wheat?