Out of 50 students in a class, 30 are boys. Find the ratio of
(i) number of boys to the number of girls.
(ii) number of girls to the total number of students.
(iii) number of boys to the total number of students.

Which of the two ratios is larger? 4 : 5 or 8 : 15

Which of the two ratios is larger? 1 : 2 or 2 : 1

A heater uses 3 units of electricity in 40 minutes. How many units does it consume in 2 hours?

A particular high school has 1500 students 50 teachers and 5 administrators. If the school grows to 1800 students and the ratios are maintained, then find the number of teachers and administrators.