Question: in what ratio must tea at rs . 60 per kg be mixed with tea at rs . 70 per kg so that the mixture must be worth rs . 63 per kg ?
A) 3 : 1
B) 3 : 2
C) 4 : 3
D) 7 : 3
E) none
Correct answer: d
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.3