Addition & Subtraction

(16)  Binu drove 32 km in a week and Dipu drove 13 lesser km than Binu. How many km did Binu and Dipu drive in a week?

          A. 19 km             B. 51 km             C. 53 km            D. 52 km

(17)  Golu, Riya and Kiran were making bracelets with beads. Golu used 22 beads, Riya used 12 beads, and Kiran used 15 beads. How many beads were used altogether?

          A. 34                   B. 48                   C. 37                   D. 49

(18)  There are 36 students in second grade and 27 students in third grade. How many more students are there in second grade?