There is a total of 270 men, women and children on a train. the ratio of men to women is 4 : 5. the ratio of women to children is 10 : 9. how many men are on the train?

Because the ratio of women to children is 10:1, double the ratio of men to women so the women are both 10:

Men to women becomes 8:10

Now total the 3 ratios: 8 for men, 10, for women and 9 for children:

8 + 10 + 9 = 27

Divide total people by that number:

270/27 = 10

Multiply 10 by each ratio:

Men = 8 * 10 = 80

Women = 10 * 10 = 100

Children = 9 *10 = 90

There is 80 men.

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.