In a school, there are 30 teachers who teach mathematics or physics. of these, 18 teach mathematics and 6 teach both physics and mathematics. how many teach physics only? in venn diagram
Pesticides are substances that are meant to control pests.[1] This includes herbicide, insecticide, nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, microbicide, fungicide, and lampricide.[2][3] The most common of these are herbicides which account for approximately 80% of all pesticide use.[4] Most pesticides are intended to serve as plant protection products (also known as crop protection products), which in general, protect plants from weeds, fungi, or insects. As an example, the fungus Alternaria solani is used to combat the aquatic weed Salvinia.
In general, a pesticide is a chemical (such as carbamate) or biological agent (such as a virus, bacterium, or fungus) that deters, incapacitates, kills, or otherwise discourages pests. Target pests can include insects, plant pathogens, weeds, molluscs, birds, mammals, fish, nematodes (roundworms), and microbes that destroy property, cause nuisance, or spread disease, or are disease vectors. Along with these benefits, pesticides also have drawbacks, such as potential toxicity to humans and other species.
Answers & Comments
let p and m be the no. of teacher who teach physics and mathematics
Here,
n(u) = 30
no. (m) = 18
n(pnm) = 6
n . (p) =?
Now
no. (p) = n(m) - n(pnm)
= 18 - 6
= 12
Hence,
No. of teacher who teach physics are 12.
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Verified answer
Pesticides are substances that are meant to control pests.[1] This includes herbicide, insecticide, nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, microbicide, fungicide, and lampricide.[2][3] The most common of these are herbicides which account for approximately 80% of all pesticide use.[4] Most pesticides are intended to serve as plant protection products (also known as crop protection products), which in general, protect plants from weeds, fungi, or insects. As an example, the fungus Alternaria solani is used to combat the aquatic weed Salvinia.
In general, a pesticide is a chemical (such as carbamate) or biological agent (such as a virus, bacterium, or fungus) that deters, incapacitates, kills, or otherwise discourages pests. Target pests can include insects, plant pathogens, weeds, molluscs, birds, mammals, fish, nematodes (roundworms), and microbes that destroy property, cause nuisance, or spread disease, or are disease vectors. Along with these benefits, pesticides also have drawbacks, such as potential toxicity to humans and other species.