Rose ran 2 1/4 miles, Jane ran 2 3/8 miles, and Sarah ran 2 7/10 miles. How many miles did the three girls run altogether? A. 6 7/10 miles B. 6 15/40 miles C. 7 13/40 miles D. 8 3/40 miles

C

Step-by-step explanation:

first, make them all have common denominators, which in this case the common denominator would be 40. whatever number you multiply the denominator by to get 40, multiply the numerator by the same number.

for example, for 2 1/4 you'd multiply the denominator by 10 to get 40, so you'd also multiply the numerator by 10, so you'd get 2 10/40.

Rose ran: 2 10/40 miles,

Jane ran 2 15/40 miles,

Sarah ran 2 28/40 miles.

then, you can add, and you'll get 6 53/40 miles, which is 7 13/40 miles.

C.

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls