72% of the total number of students in a school are boys. If there are 1800 boys, find the total number of students. Also find the ratio of the number boys to the number of girls.

total number of students is  2500

ratio is 18:7

Step-by-step explanation:

since 72% of the school are boys and number of boys is 1800

means that :

72% * x = 1800

NB : is the number of students in the school

x = 1800/72%

x = 1800/0.72

x = 2500

total number of students is  2500

the number of girls in the school

2500 - 1800

= 700 girls

1800 : 700

can divide by 100

18 : 7

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