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If the atomic weight of C and Si are 12 and 28 respectively , then what is the ratio of the number of neutrons in them?

Exmine the given graph carefully. In the graph show above represents the number of girls in a particular class and represents the number of boys in the same class. Read and answer the following questions. (i) Which class has the least number of students ? (ii) Which class has maximum number of students ? (iii) What is the ratio between the number of girls and the number of boys of class V.

There are 20 girls and 15 boys in a class.(a) What is the ratio of number of girls to the number of boys?(b) What is the ratio of number of girls to the total number of students in the class?

A dispositive ion has 12 protons .What is the number of electrons in the tetrapositive ion ?

The following histogram depicts the marks obtained by 45 students of a class: Figure: Look at the histogram and answer the following questions: What is the class size? How many students obtained less than 10 marks? How many students obtained 30 or more marks but less than 40? What is the interval of highest marks and how many students are there in this interval? If passing marks are 30, what is the number of failures?

30% of what number of 12?

Number of chromosomes is 12 in endosperm. What shall be the number in megaspore mother cell .

The table above gives the number of male and female students at Washington High School who are taking Advanced Placement (AP) classes and those who are not. What is the proportions of the total number of students at the school who are both male and NOT taking AP classes?