1. 24-carat gold is pure gold. 18-carat gold is 3/4 gold and 20-carat gold is 5/6 gold. The ratio of pure gold in 20-carat gold to pure gold in 18-carat gold is   8 : 5   9 : 10   5 : 8   10 : 9   5 : 4   Hint Half-n-half Clue   2. The ratio of 8 inches to 4 feet is   2 : 1   6 : 1   1 : 6   1 : 2   1 : 4   Half-n-half Clue   3. If there are 16 ounces in 1 pound, the ratio of 6 ounces to 3¾ pounds is   8 : 5   1 : 10   2 : 1   10 : 1   5 : 8   Half-n-half Clue   4. x is proportional to y. If x = 7 when y = 8, what is x when y = 42?   48.75   48.25   48   36   36.75   Half-n-half Clue   5. If a field is 55 m long and 45 m wide, then the ratio of its length to its perimeter is   11 : 40   9 : 20   11 : 20   11 : 9   9 : 40   Half-n-half Clue   6. A fertilizer contains 3 parts nitrogen, 2 parts phosphate and 2 parts potash by weight. The weight of fertilizer that will contain 36 pounds of nitrogen is   126 pounds   60 pounds   90 pounds   84 pounds   63 pounds   Half-n-half Clue   7. If 4 : 9 = 63 : x, then x =   28   144   28.75   141.75   141   Half-n-half Clue