Traci and Harris are baking cakes together. Traci has brought flour from her own house and Harris has 400g of flour in his house. Each cake needs 100g of flour and Traci and Harris have created 9 cakes each. How much flour, in grams, did Traci bring from her own house? Give the rationale and then the answer.
Let's think step by step. To make the cakes, Traci and Harris used a total of 9 cakes * 100g of flour per cake = 900g of flour. Traci therefore brought 900g of needed flour – 400g of flour from Harris’ flour = 500g of flour from her own house.. The answer is: 500.

Ralph is a member of the cross-country relay team. There are four other members on the team who run 3 km to complete their part of the race. Ralph runs twice as much as any member on his team to complete his part of the race. How long is the race? Give the rationale and then the answer.
Let's think step by step. 4 team members each run 3 km, so 4 x 3 = 12 km. Ralph runs twice as much as any team member and since team members each run 3 km, Ralph runs 2 x 3 km = 6 km. The length of the race is 6 km run by Ralph + 12 km run by the rest of the team = 18 km.. The answer is: 18.

Viggo's age was 10 years more than twice his younger brother's age when his brother was 2. If his younger brother is currently 10 years old, what's the sum of theirs ages? Give the rationale and then the answer.
Let's think step by step. Twice Viggo's younger brother's age when his brother was 2 is 2 * 2 = 4 years. If Viggo's age was 10 more than twice his younger brother's age when his brother was 2, Viggo was 10 + 4 = 14 years old. Viggo is 14 years - 2 years = 12 years older than his brother. Since Viggo's brother is currently 10 and Vigo is 12 years older, he's currently 10 + 12 = 22 years old. Their combined age is 22 years + 10 years = 32 years.. The answer is: 32.