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First column = (28 × 10) ÷ 4 = 70 Third column = (35 × 15) ÷ 5 =105 Second column = (32 ×12) ÷ ? = 96 = 4.
If 'a' is the mean proportion of 12.8 and 0.8 and 'b' is the third proportional to 1.2 and 4.8, then find (a + b) :(b - a) .
In a class of 240 students, 20% decided to leave. From those who stayed, the ratio of boys to girls is 11:13. How many girls are currently in the class?
The ratio of the two numbers is 5:12. 120% of the first number is equal to the 30% of the second number. Find the sum of both the numbers.
Two numbers are in the ratio 5:3. After adding 4 and 7 to them respectively the ratio becomes 2:3. Find the bigger number.
