In a survey of 240 people, It was found that 130 of people like tea,120 of people like coffee while 40 do not like both tea and coffee .by drawing Venn diagram, find the number of people who like both tea and cofee​

the number of people who like both tea and cofee is 50

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.