Let 1200 timber logs be stacked in 20 layers. Calculate the number of logs in the first layer if each successive layer has 4 logs less than the previous layer

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

If rt is greater than ba, which statement must be true ?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?