Out of 1200 pupils in a school. 900 ,rest boys and the rest are girls. If 20% of the boys and 30% of the girls wear spectacles. find: (i) how many pupils in all. wear spetacles ? (ii) what percent of the total numbe1 of pupils wear spectacles ?
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Total number of pupils = 1200
No. of boys = 900
And no. of girls = 1200 -900 = 300
No. of boys who wear spectacles = 20% of 900 = \frac{20}{100}\times900=180
100
20
×900=180
No. of girlwho wear spectacles =30% of 300 = \frac{30}{100}\times300=90
100
30
×300=90
(i) Total number of pupils who wear spectacles = 180 + 90 = 270
(ii) Percentage of pupils who wear spectacles = \frac{270\times100}{1200}=22.5\%
1200
270×100
=22.5%
Explanation:
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