61% of the water consumption is industrial use and 35% is personal use so (61% - 35%) = 26% more water is used for industrial purposes. 5,000 gallons are consumed daily so industry consumes \( \frac{26}{100} \) x 5,000 gallons = 1,300 gallons.

To find the average of these 4 numbers add them together then divide by 4:

\( \frac{15 + 13 + 17 + 11}{4} \) = \( \frac{56}{4} \) = 14

If a single cook can bake 3 large cakes per hour and the kitchen is available for 2 hours, a single cook can bake 3 x 2 = 6 large cakes during that time. 25 large cakes are needed for the party so \( \frac{25}{6} \) = 4\(\frac{1}{6}\) cooks are needed to bake the required number of large cakes.

If a single cook can bake 12 small cakes per hour and the kitchen is available for 2 hours, a single cook can bake 12 x 2 = 24 small cakes during that time. 210 small cakes are needed for the party so \( \frac{210}{24} \) = 8\(\frac{3}{4}\) cooks are needed to bake the required number of small cakes.

Because you can't employ a fractional cook, round the number of cooks needed for each type of cake up to the next whole number resulting in 5 + 9 = 14 cooks.

Betty scored 87% on the test meaning she earned 87% of the possible points on the test. There were 300 possible points on the test so she earned 300 x 0.87 = 261 points. Each question is worth 3 points so she got \( \frac{261}{3} \) = 87 questions right.

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{2}{7} \) x \( \frac{1}{5} \) = \( \frac{2 x 1}{7 x 5} \) = \( \frac{2}{35} \) = \(\frac{2}{35}\)