More than one way possible but use a variable for temperature (highest of each day?) on day 10; x.
WHICH DAY TEMPERATURE
Day 1 x-4
Day 4 (x-4)+6
Day 10 x
HIGHEST, 62
The description, if written better, might be :
For a science project you record temperature each day. The high temperature on day 1 was 6 less than on day 4, and 4 less than on day 10. The high temperature AMONG DAYS 1, 4, AND 10, was 62. What was the high temperature on day 1?
YOU can decide which of those days had the highest temperature, and the value of each days' temperature.