11. 17 heartbeats in 15 seconds vs 68 heartbeats is 60 seconds, 15 is one fourth of 60 so to see if they are equal we will simply multiply 17 by 4 which equals=68 which means the rates are equal. 12. 96 miles for 4 gallons vs 380 miles for 15 gallons, 15/4=3.75 so we know we must multiply 96 by 3.75, 96*3.75=360 which means this rate is equal