 
<translate> Tambayar ita ce: Maryamu tana ƙidaya adadin minnows a cikin tafkin. 40% na minnows suna da jan ciki, 30% suna da koren ciki kuma sauran suna da fararen ciki. Idan tsuntsaye 20 suna da jan ciki, tsuntsaye nawa ne suke da farin ciki? Hanyoyin hankali: Da farko sami jimlar adadin minnows ta hanyar rarraba adadin minnows ja da kashi na minnows da suke ja: 20 minnows / 40% = 50 minnows. Sa'an nan ka cire kashi na ja - da kuma kore - belled minnows don samun kashi na farin - belled minnows: 100% - 40% - 30% = 30%. Sa'an nan kuma ninka yawan adadin minnows ta kashi wanda ke da farin ciki: 30% * 50 minnows = 15 minnows. <eng> The question is: Mary is counting the number of minnows in the pond. 40% of the minnows have red bellies, 30% have green bellies and the rest have white bellies. If 20 minnows have red bellies, how many minnows have white bellies?
Stream of consciousness: First find the total number of minnows by dividing the number of red minnows by the percentage of minnows that are red: 20 minnows / 40% = 50 minnows. Then subtract the percentages of red - and green - bellied minnows to find the percentage of white - bellied minnows: 100% - 40% - 30% = 30%. Then multiply the total number of minnows by the percentage that have white bellies: 30% * 50 minnows = 15 minnows.
 