Question

There are 280 counters in a bag

1/2 of the counters are red
2/5 of the counters are yellow
the rest are green
work out the number of green counters in the bag

Answer 1

28

Explanation:

1/2×280=140(red counters)

2/5×280=112(yellow counters)

140+112=252

280-252=28(green counters)

Answer 2

84 counters

Explanation:

⅖ + ½ = 7/10

10 - 7 = 3

280 ÷ 10 × 3 = 84