Khadi ya mmuelli kwa lebenkele e ba naya tuelo ya $1 mo thekong ya bone e e latelang mo go tsone tsotlhe tse di $20 tse ba di dirisang. Mo maitseboeng a bone a bofelo a go reka, ba dirisitse $80. Mo maitseboeng ano a go reka, ba dirisitse $43, ba dirisa dituelo tsa bone, mme ba dirisa setlankana se se ntseng se ba ntsha gabedi ya dituelo tsa bone mo tlhwatlhwa. Ke bokae jalo jo bareki ba bo dueleletseng mo maitseboeng ano a go reka? 

The cell-phone recharges at the rate of 1 percentage-point of charge per 3 minutes. Now, the phone is at 60% charged. How long will it take to fully charge, in hours?
Mmuelli o ne a na le 80 / 20 = $<<80/20=4>>4 mo dituelong.
Setlankana sa bone se ne se lekana le  4 * 2 = $<<4*2=8>>8.
Ka jalo, ba duela 43 - 4 - 8 = $<<43-4-8=31>>31 mo maitseboeng ano a go reka. 
#### 31 

100-60=<<100-60=40>>40 percentage points.
Then 40*3=<<40*3=120>>120 minutes to fully charge.
And 120/60=<<120/60=2>>2 hours.
#### 2