9. A 100 kg mixture of two different types of nuts costs $550. If type A costs $4 per kg and type B costs $7 per kg, how many kg of each type were used?

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

134.6 us dollars

step-by-step explanation:

1 us dollar = 1.33 canadian dollars

so, 150 us dollars = 150 × 1.33 = $199.5.

in canada, the money mitchell spent = 20 canadian dollars.

remaining canadian dollars with him = 199.5 - 20 = 179.5.

after mitchell returned to us, he exchanged the remaining canadian dollars to us dollars.

179.5 canadian dollars = 179.5 × 0.75 = 134.6 us dollars.