If N divided by 5 leaves a remainder of 3, then one's digit of N must be ______.
If N÷5 leaves a remainder of 3, what might be the ones digit of the number N?
When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of : (a) either a convex mirror or convex lens (b) either a concave mirror or concave lens (c) either a concave mirror or convex lens (d) either a convex mirror or concave lens