Mojaditiro o tshwanetse go phepafatsa sekolo se se nang le diphaposi tsa borutelo di le 80. Ba na le malatsi a le 5 go di fetsa. Go ba tsaya metsotso e le 15 go phepafatsa phaposi e le nngwe. Fa ba bereka diura di le 8 ka letsatsi, ke peresente e e kae ya letsatsi la bone, ka go tlwaelegile, e e dirisiwang go phepafatsa diphaposi tsa borutelo?

Last Friday, 13 of the 82 teachers at Rydell Elementary School were sick. There were 9 substitute teachers called in to help. How many teachers were at school that day?
Ba tshwanetse go phepafatsa diphaposi tsa borutelo di le 16 ka letsatsi ka gonne 80 / 5 = <<80/5=16>>16
Ba dirisa metsotso e le 240 go phepafatsa ka letsatsi ka gonne 16 x 15 = <<16*15=240>>240
Ba dirisa diura di le 4 ka letsatsi ka gonne 240 / 60 = <<240/60=4>>4
Ba dirisa halofo ya letsatsi la bone go phepafatsa diphaposi tsa borutelo ka gonne 4 / 8 = <<4/8=.5>>.5
Ba dirisa 50% ya letsatsi la bone go phepafatsa diphaposi tsa borutelo ka gonne .5 x 100 = <<.5*100=50>>50
#### 50 

There were 82 – 13 = <<82-13=69>>69 regular teachers at school.
If we add the substitute teachers, we find there were 69 + 9 = <<69+9=78>>78 teachers at school that day.
#### 78