Question: find the ratio in which rice at rs . 7.20 a kg be mixed with rice at rs . 5.60 a kg to produce a mixture worth rs . 6.30 a kg ?
A) 1 : 3
B) 2 : 3
C) 3 : 4
D) 7 : 9
E) none of these
Correct answer: d
Grade: 7 | Topic: Ratios and proportions | Difficulty: Hard | Standard: 7.RP.A.3