What's the answer to this problem?​

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second