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Step-by-step explanation:

Answer: Total strength of school is 2856. Need to determine total strength of the school. As ratio of boys and girls is 12 : 5 , lets assume number of boys = 12x and number of girls = 5x . Hence total strength of school is 2856.

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Answer:2016 boys

Step-by-step explanation:

If the ratio of number of boys to the number of girls in a class is 12:5, then for every 5 girls, there are 12 boys.

If there are 840 girls in the school, then to find the number of boys, we can multiply the number of girls by the ratio:

840 girls * (12 boys / 5 girls) = 840 * (12/5) = 840 * 2.4 = 2016

So, there are approximately 2016 boys in the school.