During a marathon race an athlete loses 2 % of his mass. At the end of the race his mass is 67.13 kg.
Calculate his mass before the race.

his mass before the race was 68.5kg

Step-by-step explanation:

let,his mass before the race was 'x'

By question,

x-2% of x =67.13

or,x- 2x/100=67.13

or, 98x/100=67.13

or,98x=67.13×100

or,98x=6713

or,x=6713÷98

or,x=68.5

thus,his mass before the race was 68.5 kg

7 weeks

step-by-step explanation:

convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.

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