serius kak jabanya berserta cara nya saya bingung kak

1) C/R = 5/4
40/R = 5/4 ---> R = (40x4) : 5 = 24

2) C/(F-32) = 5/9 ----> F-32 = (15 x 9) :5
= 9
F-32=9
F = 41