87/3=29 bags

87/5= 17.4 bags

87 is a multiple of 3, not a multiple of 5.

An integer can be divisible by another integer, which is a multiple of another integer. For example, 15 can be divisible by 3 or 5, so 15 is a multiple of 3 and 5.

(2) The quotient obtained by dividing one number by another. For example, a÷b=c, that is, A is a multiple of B, for example, A÷B=C, it can be said that A is C times that of B.

A number has countless multiples, that is, the set of multiples of a number is infinite. Note: you can't call a number a multiple alone, you can only say who is a multiple of who.