If x is a prime number then x+1 is not a prime number

If lmn=xyz, which congruences are true by cpctc? check all that apply

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal