This is the concept of algebra, we are required to find a number,x, such that 87 decreased by three times a number is great than one hundred and sixty-five.
Supposed the number is x, three times the number will be: 3*x=3x thus; 87-3x≥165 -3x≥165-87 -3x≥78 dividing both sides by -3 we get: (-3x)/(-3x)≥78/(-3) x≤-26 This implies that the number is less than or equal to 26
