Moemedi wa lefatshe o dirisitse R5 mo go tsebiso nngwe le nngwe ya lokwalodikgang mme a dirisa R75 mo go tsebiso nngwe le nngwe ya thelebishene.  O rekile ditsebiso tsa lokwalodikgang di le 50 le ditsebiso tsa thelebishene di le 15. Moemedi wa lefatshe o dirisitse bokae go reka ditsebiso tsotlhe? 

It takes 20 minutes for the oil to heat up to 300 degrees.  It then takes 40% longer for the oil to heat up to the desired temperature of 400 degrees.  After warming the oil it takes 5 minutes less time to cook than it took to warm up the oil.  How much time passes from starting the oil to having cooked chicken?
O dirisitse R5 x 50 = R<<5*50=250>>250 mo ditsebisong tsa lokwalodikgang.
O dirisitse R75 x 15 = R<<75*15=1125>>1125 mo ditsebisong tsa thelebishene.
Ka jalo, moemedi wa lefatshe o dirisitse R250 + R1125 = R<<250+1125=1375>>1375 mo go rekeng ditsebiso tsotlhe. 
#### 1375 

It takes 20*.4=8 more minutes to go from 300 to 400 degrees than from room temperature to 300
So it takes 20+8=<<20+8=28>>28 minutes to warm up
So the total warming time was 28+20=<<28+20=48>>48 minutes
So it took 48-5=<<48-5=43>>43 minutes to cook the chicken
So it took 48+43=<<48+43=91>>91 minutes to make the chicken.
#### 91