Tolong kerjain dong,pake cara ya.Thank you :))

For 4 mangoes, there are 3 rotten ones.

a. the ratio of good mangoes and rotten mangoes is 1 : 3

b. if there 24 rotten mangoes, the good mangoes there were :
    good mangoes : rotten mangoes = 1 : 3
    the good manggoes are 1/3 x 24 = 8 mangoes

Hopefully help...