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 By: zemzyy (offline)  Wednesday, February 01 2012 @ 02:02 AM CST (Read 945 times)
zemzyy

There are 860 pupils in a school. 1/3 if the boys and 1/5 of the girls wear spectacles while the rest do not wear spectacles. The total number of pupils who wear spectacles is 240.

a) How many boys are there in the school?

b) How many girls do not wear spectacles?

Newbie

Registered: 05/19/11
Posts: 3

 By: shanmugamshanthi (offline)  Wednesday, February 01 2012 @ 06:24 AM CST
shanmugamshanthi

use simultaneous concept

3/3of boys+5/5 of girls =860....(1)
1/3of boys+1/5 of girls =240....(2)

multiply (2) by 3

3/3 of boys +3/5 of girls =240*3 ...(3)

(1)-(3)
2/5 of girls =860-720=140
1/5 of girls =140/2=70
girls =70*5=350
(a)boys =860-350=510

(b)4/5 of girls havent wear spectacles
1/5 of girls =70
4/5 of girls=70*4=280

Newbie

Registered: 12/31/06
Posts: 5

 By: zemzyy (offline)  Thursday, February 02 2012 @ 03:04 AM CST
zemzyy

Thanks for your great help p al!

Newbie

Registered: 05/19/11
Posts: 3

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