Under very specific instructions, a jeweller made one ring for the queen and one ring for the princess. The gem on the queen's ring weighed 4 carats and the stone on the princess's ring weighed 1 1/2 carats. How much heavier was the stone on the queen's ring than the stone on the princess's?Write your answer as a fraction or as a whole or mixed number.

Professor Jacobson weighed two pieces of metal for an experiment. The piece of iron weighed 9/10 of a pound and the piece of aluminum weighed 1/5 of a pound. How much more did the piece of iron weigh than the piece of aluminum?Write your answer as a fraction or as a whole or mixed number.

The value of a diamond varies directly with the square of its weight. A diamond is cut into three pieces whose weights are in the ratio 3 : 4 : 5. Consequently, by what percentage does the value of the diamond diminish?

Zoe made a fruit salad with 7/8 of a pound of melon and 1/4 of a pound of berries. How many pounds of fruit did Zoe use in all?Write your answer as a fraction or as a whole or mixed number.

Jenny caught a 4 3/4 pound fish. How much did it weigh in ounces? Write your answer as a whole number or a mixed number in simplest form. Include the correct unit in your answer.

Samantha bought 2 jewellery boxes and 4 necklaces for $132. If 1 jewellery box costs the same as 4 necklaces, what is the cost of 1 jewellery box and 1 necklace?The cost of 1 jewellery box and 1 necklace is $.