Problem 14(Second Session 2002) A cake-shop sells, on the same day, 15 pies. Some of these pies are apple-pies and the others are strawberry
price of one apple-pie is 150 L. L while the price of one strawberry-pie is 200 L. L. The total selling price of
2600 L. L.
1. Translate the given information into a system of two equations with two unknowns.
2. Solve the obtained system, showing the followed steps in details, and find the number of apple pies and
strawberry-pies.

Astudent is determining the influence of different types of food on the growth rate of spiders. she feeds one group of spiders two caterpillars twice a week. the other group received similarly-sized beetles twice a week. she records the amount of time required for individuals to reach sexual maturity. her hypothesis is that the spiders feeding on caterpillars will have a faster growth rate because caterpillars have a higher protein content compared to beetles. in this experiment, what is the dependent variable? spiders assigned to different feeding groups. time required to reach sexual maturity number of prey items fed twice a week. growth rates of each group.